diff --git a/DESCRIPTION b/DESCRIPTION
index 53439b8e..29c6a3a3 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -33,7 +33,7 @@ Imports:
     glue,
     magrittr,
     omopgenerics (>= 0.2.1),
-    PatientProfiles (>= 1.1.0),
+    PatientProfiles (>= 1.2.0),
     purrr,
     rlang,
     tidyr,
@@ -68,5 +68,4 @@ Depends:
     R (>= 4.1)
 URL: https://ohdsi.github.io/CohortConstructor/
 Remotes:
-    darwin-eu-dev/PatientProfiles
     darwin-eu/visOmopResults
diff --git a/R/mockCohortConstructor.R b/R/mockCohortConstructor.R
index cd0859ac..3a9e1a40 100644
--- a/R/mockCohortConstructor.R
+++ b/R/mockCohortConstructor.R
@@ -46,10 +46,10 @@ mockCohortConstructor <- function(nPerson = 10,
   if (is.null(tables)) {
     cdm <- omock::mockCdmReference() |>
       omock::mockVocabularyTables(concept = conceptTable) |>
-      omock::mockPerson(nPerson = nPerson) |>
-      omock::mockObservationPeriod() |>
-      omock::mockCohort(name = "cohort1") |>
-      omock::mockCohort(name = "cohort2", numberCohorts = 2)
+      omock::mockPerson(nPerson = nPerson,seed = seed) |>
+      omock::mockObservationPeriod(seed = seed) |>
+      omock::mockCohort(name = "cohort1", seed = seed) |>
+      omock::mockCohort(name = "cohort2", numberCohorts = 2, seed = seed)
   } else {
     cdm <- omock::mockCdmFromTables(tables = tables, seed = seed) |>
       omock::mockVocabularyTables(concept = conceptTable)
@@ -60,19 +60,19 @@ mockCohortConstructor <- function(nPerson = 10,
   }
 
   if (drugExposure) {
-    cdm <- cdm |> omock::mockDrugExposure()
+    cdm <- cdm |> omock::mockDrugExposure(seed = seed)
   }
 
   if (conditionOccurrence) {
-    cdm <- cdm |> omock::mockConditionOccurrence()
+    cdm <- cdm |> omock::mockConditionOccurrence(seed = seed)
   }
 
   if (death) {
-    cdm <- cdm |> omock::mockDeath()
+    cdm <- cdm |> omock::mockDeath(seed = seed)
   }
 
   if (measurement) {
-    cdm <- cdm |> omock::mockMeasurement()
+    cdm <- cdm |> omock::mockMeasurement(seed = seed)
   }
 
   if (!is.null(otherTables)) {
diff --git a/R/requireConceptIntersect.R b/R/requireConceptIntersect.R
index cc926fb1..e9df0844 100644
--- a/R/requireConceptIntersect.R
+++ b/R/requireConceptIntersect.R
@@ -23,7 +23,7 @@
 #' cdm <- mockCohortConstructor(conditionOccurrence = TRUE)
 #' cdm$cohort2 <-  requireConceptIntersect(
 #'   cohort = cdm$cohort1,
-#'   conceptSet = list(a = 1),
+#'   conceptSet = list(a = 194152),
 #'   window = c(-Inf, 0),
 #'   name = "cohort2")
 #'   }
diff --git a/R/sampleCohorts.R b/R/sampleCohorts.R
index f9064a7d..02f84ce0 100644
--- a/R/sampleCohorts.R
+++ b/R/sampleCohorts.R
@@ -5,7 +5,7 @@
 #' people. All records of these individuals are preserved.
 #'
 #' @inheritParams cohortDoc
-#' @inheritParams cohortIdSubsetDoc
+#' @inheritParams cohortIdModifyDoc
 #' @inheritParams nameDoc
 #' @param n Number of people to be sampled for each included cohort.
 #'
diff --git a/R/unionCohorts.R b/R/unionCohorts.R
index 36cddf04..45a9cc88 100644
--- a/R/unionCohorts.R
+++ b/R/unionCohorts.R
@@ -65,15 +65,17 @@ unionCohorts <- function(cohort,
   tmpTable  <- omopgenerics::uniqueTableName()
   unionedCohort <- cohort |>
     dplyr::filter(.data$cohort_definition_id %in% .env$cohortId) |>
-    joinOverlap(name = name, by = "subject_id", gap = gap) |>
+    joinOverlap(name = tmpTable,
+                by = "subject_id",
+                gap = gap) |>
     dplyr::mutate(cohort_definition_id = 1L) |>
+    dplyr::relocate(dplyr::all_of(omopgenerics::cohortColumns("cohort"))) |>
     dplyr::compute(name = tmpTable, temporary = FALSE)
   cohCodelist <- attr(cohort, "cohort_codelist")
   if (!is.null(cohCodelist)) {
     cohCodelist <- cohCodelist |> dplyr::mutate("cohort_definition_id" = 1L)
   }
   unionedCohort <- unionedCohort |>
-    dplyr::relocate(dplyr::all_of(omopgenerics::cohortColumns("cohort"))) |>
     omopgenerics::newCohortTable(
       cohortSetRef = cohSet,
       cohortAttritionRef = NULL,
@@ -88,6 +90,7 @@ unionCohorts <- function(cohort,
     cdm <- bind(cohort, unionedCohort, name = name)
   }
 
+  CDMConnector::dropTable(cdm, name = tmpTable)
 
   return(cdm[[name]])
 }
diff --git a/README.Rmd b/README.Rmd
index 0d7a6b35..be24754c 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -18,6 +18,7 @@ knitr::opts_chunk$set(
 <!-- badges: start -->
 [![CRAN status](https://www.r-pkg.org/badges/version/CohortConstructor)](https://CRAN.R-project.org/package=CohortConstructor)
 [![R-CMD-check](https://github.com/OHDSI/CohortConstructor/workflows/R-CMD-check/badge.svg)](https://github.com/OHDSI/CohortConstructor/actions)
+[![Codecov test coverage](https://codecov.io/gh/OHDSI/CohortConstructor/branch/main/graph/badge.svg)](https://app.codecov.io/gh/OHDSI/CohortConstructor?branch=main)
 [![Lifecycle:Experimental](https://img.shields.io/badge/Lifecycle-Experimental-339999)](https://lifecycle.r-lib.org/articles/stages.html#experimental)
 
 <!-- badges: end -->
diff --git a/README.md b/README.md
index 99779494..e7d4e7ca 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@
 [![CRAN
 status](https://www.r-pkg.org/badges/version/CohortConstructor)](https://CRAN.R-project.org/package=CohortConstructor)
 [![R-CMD-check](https://github.com/OHDSI/CohortConstructor/workflows/R-CMD-check/badge.svg)](https://github.com/OHDSI/CohortConstructor/actions)
+[![Codecov test
+coverage](https://codecov.io/gh/OHDSI/CohortConstructor/branch/main/graph/badge.svg)](https://app.codecov.io/gh/OHDSI/CohortConstructor?branch=main)
 [![Lifecycle:Experimental](https://img.shields.io/badge/Lifecycle-Experimental-339999)](https://lifecycle.r-lib.org/articles/stages.html#experimental)
 
 <!-- badges: end -->
@@ -112,14 +114,14 @@ cohort_count(cdm$fractures) %>% glimpse()
 #> Rows: 3
 #> Columns: 3
 #> $ cohort_definition_id <int> 1, 2, 3
-#> $ number_records       <int> 462, 565, 137
-#> $ number_subjects      <int> 426, 508, 132
+#> $ number_records       <int> 464, 569, 138
+#> $ number_subjects      <int> 427, 510, 132
 attrition(cdm$fractures) %>% glimpse()
 #> Rows: 9
 #> Columns: 7
 #> $ cohort_definition_id <int> 1, 1, 1, 2, 2, 2, 3, 3, 3
-#> $ number_records       <int> 462, 462, 462, 565, 565, 565, 137, 137, 137
-#> $ number_subjects      <int> 426, 426, 426, 508, 508, 508, 132, 132, 132
+#> $ number_records       <int> 464, 464, 464, 569, 569, 569, 138, 138, 138
+#> $ number_subjects      <int> 427, 427, 427, 510, 510, 510, 132, 132, 132
 #> $ reason_id            <int> 1, 2, 3, 1, 2, 3, 1, 2, 3
 #> $ reason               <chr> "Initial qualifying events", "cohort requirements…
 #> $ excluded_records     <int> 0, 0, 0, 0, 0, 0, 0, 0, 0
@@ -134,21 +136,28 @@ our three cohorts to create this overall cohort like so:
 
 ``` r
 cdm$fractures <- unionCohorts(cdm$fractures,
-                                 cohortName = "any_fracture", 
-                                 name ="fractures")
+                              cohortName = "any_fracture", 
+                              keepOriginalCohorts = TRUE,
+                              name ="fractures")
 ```
 
 ``` r
 settings(cdm$fractures)
-#> # A tibble: 1 × 3
-#>   cohort_definition_id cohort_name    gap
-#>                  <int> <chr>        <dbl>
-#> 1                    1 any_fracture     0
+#> # A tibble: 4 × 5
+#>   cohort_definition_id cohort_name      cdm_version vocabulary_version   gap
+#>                  <int> <chr>            <chr>       <chr>              <dbl>
+#> 1                    1 ankle_fracture   5.3         v5.0 18-JAN-19        NA
+#> 2                    2 forearm_fracture 5.3         v5.0 18-JAN-19        NA
+#> 3                    3 hip_fracture     5.3         v5.0 18-JAN-19        NA
+#> 4                    4 any_fracture     <NA>        <NA>                   0
 cohortCount(cdm$fractures)
-#> # A tibble: 1 × 3
+#> # A tibble: 4 × 3
 #>   cohort_definition_id number_records number_subjects
 #>                  <int>          <int>           <int>
-#> 1                    1           1164             922
+#> 1                    1            464             427
+#> 2                    2            569             510
+#> 3                    3            138             132
+#> 4                    4           1171             924
 ```
 
 ### Require in date range
@@ -168,11 +177,11 @@ attributes have been updated
 
 ``` r
 cohort_count(cdm$fractures) %>% glimpse()
-#> Rows: 1
+#> Rows: 4
 #> Columns: 3
-#> $ cohort_definition_id <int> 1
-#> $ number_records       <int> 315
-#> $ number_subjects      <int> 282
+#> $ cohort_definition_id <int> 1, 2, 3, 4
+#> $ number_records       <int> 108, 152, 62, 322
+#> $ number_subjects      <int> 104, 143, 60, 287
 attrition(cdm$fractures) %>% 
   filter(reason == "cohort_start_date between 2000-01-01 & 2020-01-01") %>% 
   glimpse()
@@ -205,28 +214,28 @@ criteria.
 attrition(cdm$fractures) %>% 
   filter(reason == "Age requirement: 40 to 65") %>% 
   glimpse()
-#> Rows: 1
+#> Rows: 4
 #> Columns: 7
-#> $ cohort_definition_id <int> 1
-#> $ number_records       <int> 124
-#> $ number_subjects      <int> 118
-#> $ reason_id            <int> 4
-#> $ reason               <chr> "Age requirement: 40 to 65"
-#> $ excluded_records     <int> 191
-#> $ excluded_subjects    <int> 164
+#> $ cohort_definition_id <int> 1, 2, 3, 4
+#> $ number_records       <int> 43, 64, 22, 129
+#> $ number_subjects      <int> 43, 62, 22, 122
+#> $ reason_id            <int> 6, 6, 6, 4
+#> $ reason               <chr> "Age requirement: 40 to 65", "Age requirement: 40…
+#> $ excluded_records     <int> 65, 88, 40, 193
+#> $ excluded_subjects    <int> 61, 81, 38, 165
 
 attrition(cdm$fractures) %>% 
   filter(reason == "Sex requirement: Female") %>% 
   glimpse()
-#> Rows: 1
+#> Rows: 4
 #> Columns: 7
-#> $ cohort_definition_id <int> 1
-#> $ number_records       <int> 64
-#> $ number_subjects      <int> 62
-#> $ reason_id            <int> 5
-#> $ reason               <chr> "Sex requirement: Female"
-#> $ excluded_records     <int> 60
-#> $ excluded_subjects    <int> 56
+#> $ cohort_definition_id <int> 1, 2, 3, 4
+#> $ number_records       <int> 19, 37, 12, 68
+#> $ number_subjects      <int> 19, 36, 12, 65
+#> $ reason_id            <int> 7, 7, 7, 5
+#> $ reason               <chr> "Sex requirement: Female", "Sex requirement: Fema…
+#> $ excluded_records     <int> 24, 27, 10, 61
+#> $ excluded_subjects    <int> 24, 26, 10, 57
 ```
 
 ### Require presence in another cohort
@@ -251,15 +260,15 @@ cdm$fractures <- cdm$fractures %>%
 attrition(cdm$fractures) %>% 
   filter(reason == "Not in cohort gibleed between -Inf & 0 days relative to cohort_start_date") %>% 
   glimpse()
-#> Rows: 1
+#> Rows: 4
 #> Columns: 7
-#> $ cohort_definition_id <int> 1
-#> $ number_records       <int> 64
-#> $ number_subjects      <int> 62
-#> $ reason_id            <int> 8
+#> $ cohort_definition_id <int> 1, 2, 3, 4
+#> $ number_records       <int> 14, 30, 10, 54
+#> $ number_subjects      <int> 14, 30, 10, 52
+#> $ reason_id            <int> 10, 10, 10, 8
 #> $ reason               <chr> "Not in cohort gibleed between -Inf & 0 days rela…
-#> $ excluded_records     <int> 0
-#> $ excluded_subjects    <int> 0
+#> $ excluded_records     <int> 5, 7, 2, 14
+#> $ excluded_subjects    <int> 5, 6, 2, 13
 ```
 
 ``` r
diff --git a/man/requireConceptIntersect.Rd b/man/requireConceptIntersect.Rd
index 7aafb03e..0b46db85 100644
--- a/man/requireConceptIntersect.Rd
+++ b/man/requireConceptIntersect.Rd
@@ -65,7 +65,7 @@ library(CohortConstructor)
 cdm <- mockCohortConstructor(conditionOccurrence = TRUE)
 cdm$cohort2 <-  requireConceptIntersect(
   cohort = cdm$cohort1,
-  conceptSet = list(a = 1),
+  conceptSet = list(a = 194152),
   window = c(-Inf, 0),
   name = "cohort2")
   }
diff --git a/man/sampleCohorts.Rd b/man/sampleCohorts.Rd
index 68dbd93c..128b6b0b 100644
--- a/man/sampleCohorts.Rd
+++ b/man/sampleCohorts.Rd
@@ -9,9 +9,10 @@ sampleCohorts(cohort, cohortId = NULL, n, name = tableName(cohort))
 \arguments{
 \item{cohort}{A cohort table in a cdm reference.}
 
-\item{cohortId}{Vector identifying which cohorts to include
-(cohort_definition_id or cohort_name). Cohorts not included will be
-removed from the cohort set.}
+\item{cohortId}{Vector identifying which cohorts to modify
+(cohort_definition_id or cohort_name). If NULL, all cohorts will be
+used; otherwise, only the specified cohorts will be modified, and the
+rest will remain unchanged.}
 
 \item{n}{Number of people to be sampled for each included cohort.}
 
diff --git a/tests/testthat/test-conceptCohort.R b/tests/testthat/test-conceptCohort.R
index 54ed9f72..26dcdac6 100644
--- a/tests/testthat/test-conceptCohort.R
+++ b/tests/testthat/test-conceptCohort.R
@@ -283,8 +283,8 @@ test_that("excluded concepts in codelist", {
 test_that("out of observation", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod()
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1)
   cdm_local$concept <- dplyr::tibble(
     "concept_id" = c(1, 2),
     "concept_name" = c("my concept 1", "my concept 2"),
@@ -343,8 +343,8 @@ test_that("out of observation", {
   # event starts out, end in (subject 3)
   # no concept 2
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod()
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1)
   cdm_local$concept <- dplyr::tibble(
     "concept_id" = c(1, 2),
     "concept_name" = c("my concept 1", "my concept 2"),
@@ -384,8 +384,8 @@ test_that("out of observation", {
   # out of observation (subject 3)
   # overlapping (subject 4)
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod()
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1)
   cdm_local$concept <- dplyr::tibble(
     "concept_id" = c(1, 2),
     "concept_name" = c("my concept 1", "my concept 2"),
diff --git a/tests/testthat/test-exitAtDate.R b/tests/testthat/test-exitAtDate.R
index 67ba1724..5db1387f 100644
--- a/tests/testthat/test-exitAtDate.R
+++ b/tests/testthat/test-exitAtDate.R
@@ -1,24 +1,24 @@
 test_that("exit at observation end", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort"), numberCohorts = 2)
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort"), numberCohorts = 2,seed = 1)
   cdm <- cdm_local |> copyCdm()
   # simple example - test it works
   cdm$cohort1 <- cdm$cohort |> exitAtObservationEnd(name = "cohort1")
   expect_true(all(cdm$cohort1 |> dplyr::pull(cohort_start_date) |> sort() ==
-                    c("1997-10-22", "2000-06-23", "2001-03-30", "2015-03-05", "2015-03-25")))
+                    c("1999-05-03", "2001-03-24", "2003-05-17", "2015-02-25")))
   expect_true(all(cdm$cohort1 |> dplyr::pull(cohort_end_date) |> sort() ==
-                    c("2013-06-29", "2013-06-29", "2013-12-31", "2015-10-11", "2015-10-11")))
-  expect_true(all(cdm$cohort1 |> dplyr::pull(subject_id) |> sort() ==  c(1, 1, 3, 3, 4)))
+                    c("2003-06-15", "2013-06-29", "2013-06-29", "2015-10-11")))
+  expect_true(all(cdm$cohort1 |> dplyr::pull(subject_id) |> sort() ==  c(1, 1, 2, 3)))
 
   # test cohort id and name
   cdm$cohort <- cdm$cohort |> exitAtObservationEnd(cohortId = 1)
   expect_true(all(cdm$cohort |> dplyr::pull(cohort_start_date) |> sort() ==
-                    c("1997-10-22", "2000-06-23", "2001-03-30", "2001-07-16", "2001-12-04", "2015-03-05", "2015-03-25")))
+                    c("1999-05-03", "2001-03-24", "2001-11-28", "2002-01-30", "2002-06-13", "2003-05-17", "2015-02-25")))
   expect_true(all(cdm$cohort |> dplyr::pull(cohort_end_date) |> sort() ==
-                    c("2001-07-15", "2001-12-03", "2006-09-27", "2013-06-29", "2013-12-31", "2015-07-06", "2015-10-11")))
-  expect_true(all(cdm$cohort |> dplyr::pull(subject_id) |> sort() ==  c(1, 1, 1, 1, 3, 3, 4)))
+                    c("2001-11-27", "2002-01-29", "2002-06-12", "2003-06-15", "2005-01-15", "2013-06-29", "2015-10-11")))
+  expect_true(all(cdm$cohort |> dplyr::pull(subject_id) |> sort() ==  c(1, 1, 1, 1, 1, 2, 3)))
   expect_true(all(attrition(cdm$cohort)$reason == c("Initial qualifying events", "Exit at observation period end date", "Initial qualifying events")))
 
   # additional columns warning
@@ -35,9 +35,9 @@ test_that("exit at observation end", {
 test_that("exit at death date", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort"), numberCohorts = 2)
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort"), numberCohorts = 2,seed = 1)
   cdm_local$death <- dplyr::tibble(
     person_id = 1:2,
     death_date = as.Date(c("2013-06-29", "2003-06-15")),
@@ -48,30 +48,30 @@ test_that("exit at death date", {
   # simple example - require death TRUE works
   cdm$cohort1 <- cdm$cohort |> exitAtDeath(requireDeath = TRUE, name = "cohort1")
   expect_true(all(cdm$cohort1 |> dplyr::pull(cohort_start_date) |> sort() ==
-                    c("2000-06-23", "2001-03-30")))
+                    c("1999-05-03", "2001-03-24", "2003-05-17")))
   expect_true(all(cdm$cohort1 |> dplyr::pull(cohort_end_date) |> sort() ==
-                    c("2013-06-29", "2013-06-29")))
-  expect_true(all(cdm$cohort1 |> dplyr::pull(subject_id) |> sort() ==  c(1, 1)))
+                    c("2003-06-15", "2013-06-29", "2013-06-29")))
+  expect_true(all(cdm$cohort1 |> dplyr::pull(subject_id) |> sort() ==  c(1, 1, 2)))
   expect_true(all(attrition(cdm$cohort1)$reason ==
                     c("Initial qualifying events", "No death recorded", "Exit at death", "Initial qualifying events", "No death recorded", "Exit at death")))
 
   # simple example - require death FALSE works
   cdm$cohort2 <- cdm$cohort |> exitAtDeath(requireDeath = FALSE, name = "cohort2")
   expect_true(all(cdm$cohort2 |> dplyr::pull(cohort_start_date) |> sort() ==
-                    c("1997-10-22", "2000-06-23", "2001-03-30", "2015-03-05", "2015-03-25")))
+                    c("1999-05-03", "2001-03-24", "2003-05-17", "2015-02-25")))
   expect_true(all(cdm$cohort2 |> dplyr::pull(cohort_end_date) |> sort() ==
-                    c("1999-05-28", "2013-06-29", "2013-06-29", "2015-04-14", "2015-07-06")))
-  expect_true(all(cdm$cohort2 |> dplyr::pull(subject_id) |> sort() ==  c(1, 1, 3, 3, 4)))
+                    c("2003-06-15", "2013-06-29", "2013-06-29", "2015-04-30")))
+  expect_true(all(cdm$cohort2 |> dplyr::pull(subject_id) |> sort() ==  c(1, 1, 2, 3)))
   expect_true(all(attrition(cdm$cohort2)$reason ==
                     c("Initial qualifying events", "Exit at death", "Initial qualifying events", "Exit at death")))
 
   # cohort ID and name
   cdm$cohort <- cdm$cohort |> exitAtDeath(cohortId = 1, requireDeath = TRUE)
   expect_true(all(cdm$cohort |> dplyr::pull(cohort_start_date) |> sort() ==
-                    c("2000-06-23", "2001-03-30", "2001-07-16", "2001-12-04", "2015-03-05")))
+                    c("1999-05-03", "2001-03-24", "2001-11-28", "2002-01-30", "2002-06-13", "2003-05-17")))
   expect_true(all(cdm$cohort |> dplyr::pull(cohort_end_date) |> sort() ==
-                    c("2001-07-15", "2001-12-03", "2006-09-27", "2013-06-29", "2015-07-06")))
-  expect_true(all(cdm$cohort |> dplyr::pull(subject_id) |> sort() ==  c(1, 1, 1, 1, 3)))
+                    c("2001-11-27", "2002-01-29", "2002-06-12", "2003-06-15", "2005-01-15", "2013-06-29")))
+  expect_true(all(cdm$cohort |> dplyr::pull(subject_id) |> sort() ==  c(1, 1, 1, 1, 1, 2)))
   expect_true(all(attrition(cdm$cohort)$reason ==
                     c("Initial qualifying events", "No death recorded", "Exit at death", "Initial qualifying events")))
 
diff --git a/tests/testthat/test-intersectCohorts.R b/tests/testthat/test-intersectCohorts.R
index 23c2ef70..c7a7a0d7 100644
--- a/tests/testthat/test-intersectCohorts.R
+++ b/tests/testthat/test-intersectCohorts.R
@@ -385,8 +385,8 @@ test_that("returnNonOverlappingCohorts - three cohorts", {
 test_that("attrition and cohortId", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort1"), numberCohorts = 4, seed = 2)
   cdm_local$person <- cdm_local$person |>
     dplyr::mutate(dplyr::across(dplyr::ends_with("of_birth"), ~ as.numeric(.x)))
@@ -416,13 +416,13 @@ test_that("attrition and cohortId", {
   ))
   expect_true(all(omopgenerics::attrition(cdm$cohort1)$reason_id ==  c(1, 1:6, 1:6)))
   expect_true(all(omopgenerics::attrition(cdm$cohort1)$number_records |> sort() ==
-                    c(0, 0, 0, 0, 1, 1, 1, 4, 4, 4, 4, 4, 4)))
+                    c(0, 1, 1, 2, 2, 2, 2, 4, 4, 4, 4, 4, 4)))
   expect_true(all(omopgenerics::attrition(cdm$cohort1)$number_subjects |> sort() ==
-                    c(0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3)))
+                    c(0, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3)))
   expect_true(all(omopgenerics::attrition(cdm$cohort1)$excluded_records |> sort() ==
-                    c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 4)))
+                    c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3)))
   expect_true(all(omopgenerics::attrition(cdm$cohort1)$excluded_subjects |> sort() ==
-                    c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2)))
+                    c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2)))
   expect_true(all(omopgenerics::settings(cdm$cohort1)$cohort_name |> sort() ==
                     c("cohort_1_cohort_2", "only_in_cohort_1", "only_in_cohort_2")))
 
diff --git a/tests/testthat/test-measurementCohort.R b/tests/testthat/test-measurementCohort.R
index dabb6899..d934076d 100644
--- a/tests/testthat/test-measurementCohort.R
+++ b/tests/testthat/test-measurementCohort.R
@@ -1,5 +1,5 @@
 test_that("mearurementCohorts works", {
-  cdm <- mockCohortConstructor(con = NULL)
+  cdm <- mockCohortConstructor(con = NULL, seed = 1)
   cdm$concept <- cdm$concept |>
     dplyr::union_all(
       dplyr::tibble(
@@ -207,7 +207,7 @@ test_that("mearurementCohorts works", {
 
 test_that("expected errors", {
   testthat::skip_on_cran()
-  cdm <- mockCohortConstructor(con = NULL)
+  cdm <- mockCohortConstructor(con = NULL, seed = 1)
   cdm$concept <- cdm$concept |>
     dplyr::union_all(
       dplyr::tibble(
diff --git a/tests/testthat/test-requireCohortIntersect.R b/tests/testthat/test-requireCohortIntersect.R
index 5084bbc6..cc33782c 100644
--- a/tests/testthat/test-requireCohortIntersect.R
+++ b/tests/testthat/test-requireCohortIntersect.R
@@ -1,8 +1,8 @@
 test_that("requiring presence in another cohort", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 2) |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 2, seed = 1) |>
     omock::mockCohort(name = c("cohort2"), numberCohorts = 2, seed = 2)
   cdm <- cdm_local |> copyCdm()
 
@@ -69,9 +69,9 @@ test_that("requiring presence in another cohort", {
                                             window = c(0, Inf),
                                             censorDate = "cohort_end_date",
                                             name = "cohort5")
-  expect_true(all(cdm$cohort5 |> dplyr::pull("cohort_start_date") == c("2015-04-14", "2015-02-23")))
-  expect_true(all(cdm$cohort5 |> dplyr::pull("subject_id") == c("3", "3")))
-  expect_true(all(cdm$cohort5 |> dplyr::pull("cohort_definition_id") == c("1", "2")))
+  expect_true(all(cdm$cohort5 |> dplyr::pull("cohort_start_date") == c("2003-05-08", "2000-06-17", "2004-12-12")))
+  expect_true(all(cdm$cohort5 |> dplyr::pull("subject_id") == c("1", "1", "1")))
+  expect_true(all(cdm$cohort5 |> dplyr::pull("cohort_definition_id") == c("1", "2", "2")))
   expect_true(all(omopgenerics::attrition(cdm$cohort5)$reason ==
                     c("Initial qualifying events",
                       "In cohort cohort_2 between 0 & Inf days relative to cohort_start_date between 1 and Inf times, censoring at cohort_end_date",
@@ -87,10 +87,10 @@ test_that("requiring presence in another cohort", {
                                             censorDate = "cohort_end_date",
                                             name = "cohort6")
   expect_true(all(cdm$cohort6 |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("1993-01-06", "1999-06-23", "2000-03-06", "2003-07-21",
-                      "2015-02-23", "2015-04-14")))
-  expect_true(all(cdm$cohort6 |> dplyr::pull("subject_id") |> sort() == c("1", "2", "2", "3", "3", "4")))
-  expect_true(all(cdm$cohort6 |> dplyr::pull("cohort_definition_id") |> sort() == c(rep("1", 4), rep("2", 2))))
+                    c("1999-07-11", "2000-01-11", "2000-05-28", "2000-06-17",
+                      "2003-05-08", "2004-12-12", "2015-01-25", "2015-02-02")))
+  expect_true(all(cdm$cohort6 |> dplyr::pull("subject_id") |> sort() == c("1","1","1", "2", "2", "2", "3", "3")))
+  expect_true(all(cdm$cohort6 |> dplyr::pull("cohort_definition_id") |> sort() == c(rep("1", 4), rep("2", 4))))
   expect_true(all(omopgenerics::attrition(cdm$cohort6)$reason ==
                     c("Initial qualifying events",
                       "Initial qualifying events",
@@ -105,10 +105,9 @@ test_that("requiring presence in another cohort", {
                                             censorDate = "cohort_end_date",
                                             name = "cohort7")
   expect_true(all(cdm$cohort7 |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("1999-06-23", "2000-03-06", "2003-07-21", "2015-02-02",
-                      "2015-02-08", "2015-04-14")))
-  expect_true(all(cdm$cohort7 |> dplyr::pull("subject_id") |> sort() == c("1", "2", "2", "3", "3", "3")))
-  expect_true(all(cdm$cohort7 |> dplyr::pull("cohort_definition_id") |> sort() == c(rep("1", 4), rep("2", 2))))
+                    c("2000-01-11", "2000-05-28", "2003-05-08", "2015-01-25")))
+  expect_true(all(cdm$cohort7 |> dplyr::pull("subject_id") |> sort() == c("1", "2", "2", "3")))
+  expect_true(all(cdm$cohort7 |> dplyr::pull("cohort_definition_id") |> sort() == c(rep("1", 4))))
   expect_true(all(omopgenerics::attrition(cdm$cohort7)$reason ==
                     c("Initial qualifying events",
                       "Initial qualifying events",
@@ -143,9 +142,9 @@ test_that("requiring presence in another cohort", {
 test_that("requiring absence in another cohort", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 2) |>
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 2, seed = 1) |>
     omock::mockCohort(name = c("cohort2"), numberCohorts = 2, seed = 2)
   cdm <- cdm_local |> copyCdm()
 
@@ -201,7 +200,7 @@ test_that("different intersection count requirements", {
                          as.Date('2019-01-06'))
   )
   cdm_local <- omock::mockCdmReference() |> omock::mockCdmFromTables(tables = list("cohort1" = cohort1,
-                                                                     "cohort2" = cohort2))
+                                                                     "cohort2" = cohort2), seed = 1)
   cdm <- cdm_local |> copyCdm()
 
   # no intersections - people not in cohort2
diff --git a/tests/testthat/test-requireConceptIntersect.R b/tests/testthat/test-requireConceptIntersect.R
index 43b2efef..eb599eb6 100644
--- a/tests/testthat/test-requireConceptIntersect.R
+++ b/tests/testthat/test-requireConceptIntersect.R
@@ -1,8 +1,8 @@
 test_that("require flag in concept", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 2)
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 2, seed = 1)
   cdm_local$concept <- dplyr::tibble(
     "concept_id" = 1,
     "concept_name" = "my concept",
@@ -38,7 +38,7 @@ test_that("require flag in concept", {
   expect_true(all(cdm$cohort3 |> dplyr::pull("subject_id") ==
                     rep(1, 5)))
   expect_true(all(cdm$cohort3 |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("2000-06-23", "2001-03-30", "2001-07-16", "2001-12-04", "2003-06-15")))
+                    c("2001-03-24", "2001-11-28", "2002-01-30", "2002-06-13", "2003-05-17", "2004-03-11")))
 
   expect_true(all(omopgenerics::attrition(cdm$cohort3)$reason ==
                     c("Initial qualifying events",
@@ -52,9 +52,9 @@ test_that("require flag in concept", {
                                               window = c(-Inf, Inf),
                                               name = "cohort4")
   expect_true(all(cdm$cohort4 |> dplyr::pull("subject_id") ==
-                    c(rep(1, 5), 3)))
+                    c(rep(1, 6))))
   expect_true(all(cdm$cohort4 |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("2000-06-23", "2001-03-30", "2001-07-16", "2001-12-04", "2003-06-15", "2015-03-05")))
+                    c("2001-03-24", "2001-11-28", "2002-01-30", "2002-06-13", "2003-05-17", "2004-03-11")))
   expect_true(all(omopgenerics::attrition(cdm$cohort4)$reason ==
                     c("Initial qualifying events",
                       "Concept a between -Inf & Inf days relative to cohort_start_date between 1 and Inf",
@@ -113,9 +113,9 @@ test_that("require flag in concept", {
 test_that("requiring absence in another cohort", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 2)
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 2, seed = 1)
   cdm_local$concept <- dplyr::tibble(
     "concept_id" = 1,
     "concept_name" = "my concept",
@@ -179,9 +179,9 @@ test_that("requiring absence in another cohort", {
     name = "cohort3_exclusion_partial"
   )
   expect_true(all(cdm$cohort3_exclusion_partial |> dplyr::pull("subject_id") |> sort() ==
-                    c(1, 1, 1, 3, 3, 4)))
+                    c(1, 1, 1, 1, 2, 3)))
   expect_true(all(cdm$cohort3_exclusion_partial |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("1997-10-22", "2000-06-23", "2001-07-16", "2001-12-04", "2015-03-05", "2015-03-25")))
+                    c("1999-05-03", "2001-03-24", "2001-11-28", "2002-01-30", "2002-06-13", "2015-02-25")))
   expect_true(all(omopgenerics::attrition(cdm$cohort3_exclusion_partial)$reason ==
                     c("Initial qualifying events",
                       "Not in concept a between -Inf & Inf days relative to cohort_start_date",
@@ -201,7 +201,7 @@ test_that("different intersection count requirements", {
     cohort_end_date = as.Date('2020-01-01'))
 
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockCdmFromTables(tables = list("cohort1" = cohort1))
+    omock::mockCdmFromTables(tables = list("cohort1" = cohort1), seed = 1)
 
   cdm_local$concept <- dplyr::tibble(
     "concept_id" = 1,
diff --git a/tests/testthat/test-requireDateRange.R b/tests/testthat/test-requireDateRange.R
index c9b848f3..1a659bee 100644
--- a/tests/testthat/test-requireDateRange.R
+++ b/tests/testthat/test-requireDateRange.R
@@ -1,9 +1,9 @@
 test_that("requireDateRange", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 2) |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 2,seed = 1) |>
     omock::mockCohort(name = c("cohort2"), numberCohorts = 2, seed = 2)
   cdm <- cdm_local |> copyCdm()
 
@@ -22,7 +22,7 @@ test_that("requireDateRange", {
   expect_true(all(cdm$cohort1 %>%
                     dplyr::arrange(.data$cohort_start_date) %>%
                     dplyr::pull("cohort_start_date") ==
-                    c("2015-04-14", "2015-02-02", "2015-02-08", "2015-02-23")))
+                    c("2015-01-25", "2015-02-02")))
 
   # index date
   cdm$cohort3 <- cdm$cohort2 %>%
@@ -43,17 +43,17 @@ test_that("requireDateRange", {
                       "cohort_start_date after 2000-01-01",
                       "cohort_start_date before 2001-01-01",
                       "Initial qualifying events")))
-  expect_true(all(cohortCount(cdm$cohort4)$number_records == c(1,4)))
-  expect_true(all(cohortCount(cdm$cohort4)$number_subjects == c(1,2)))
+  expect_true(all(cohortCount(cdm$cohort4)$number_records == c(2,4)))
+  expect_true(all(cohortCount(cdm$cohort4)$number_subjects == c(1,3)))
   expect_true(all(cdm$cohort4 |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("1993-01-06", "2000-03-06", "2015-02-02", "2015-02-08", "2015-02-23")))
+                    c("1999-07-11", "2000-01-11", "2000-05-28", "2000-06-17", "2004-12-12", "2015-02-02")))
   # NA
   expect_no_error(
     cdm$cohort5 <- cdm$cohort2 %>%
       requireInDateRange(dateRange = as.Date(c(NA, "2010-01-01")), name = "cohort5")
   )
   expect_true(all(cdm$cohort5 |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("1993-01-06", "1999-06-23", "2000-03-06", "2003-07-21")))
+                    c("1999-07-11", "2000-01-11", "2000-05-28", "2000-06-17", "2003-05-08", "2004-12-12")))
   expect_true(all(attrition(cdm$cohort5)$reason ==
                     c("Initial qualifying events",
                       "cohort_start_date before 2010-01-01",
@@ -65,7 +65,7 @@ test_that("requireDateRange", {
       requireInDateRange(dateRange = as.Date(c("2000-01-01", NA)), name = "cohort6")
   )
   expect_true(all(cdm$cohort6 |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("2000-03-06", "2003-07-21", "2015-02-02", "2015-02-08", "2015-02-23", "2015-04-14")))
+                    c("2000-01-11", "2000-05-28", "2000-06-17", "2003-05-08", "2004-12-12", "2015-01-25", "2015-02-02")))
   expect_true(all(attrition(cdm$cohort6)$reason ==
                     c("Initial qualifying events",
                       "cohort_start_date after 2000-01-01",
@@ -101,9 +101,9 @@ test_that("requireDateRange", {
 test_that("trim cohort dates", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 2) |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 2, seed = 1) |>
     omock::mockCohort(name = c("cohort2"), numberCohorts = 2, seed = 2)
   cdm <- cdm_local |> copyCdm()
 
@@ -111,22 +111,22 @@ test_that("trim cohort dates", {
     trimToDateRange(dateRange = as.Date(c("2001-01-01", "2005-01-01")))
 
   expect_equal(sort(cdm$cohort1 %>%
-                      dplyr::pull("subject_id")), c(1, 1, 1, 1, 1))
+                      dplyr::pull("subject_id")), c(1, 1, 1, 1, 1, 1, 2))
   expect_true(all(cdm$cohort1 %>%
                     dplyr::pull("cohort_start_date") ==
-                    c("2001-03-30", "2003-06-15", "2001-01-01", "2001-07-16", "2001-12-04")))
+                    c("2003-05-17", "2004-03-11", "2001-01-01", "2001-03-24", "2001-11-28", "2002-01-30", "2002-06-13")))
   expect_true(all(cdm$cohort1 %>%
                     dplyr::pull("cohort_end_date") ==
-                    c("2003-06-14", "2005-01-01", "2001-07-15", "2001-12-03", "2005-01-01")))
+                    c("2004-03-10", "2005-01-01", "2001-06-15", "2001-11-27", "2002-01-29", "2002-06-12", "2005-01-01")))
 
   # cohort id
   cdm$cohort3 <- cdm$cohort2 %>%
     trimToDateRange(dateRange = as.Date(c("2001-01-01", "2005-01-01")),
                     cohortId = "cohort_1",
                     name = "cohort3")
-  expect_true(omopgenerics::cohortCount(cdm$cohort3)$number_records[1] == 1)
+  expect_true(omopgenerics::cohortCount(cdm$cohort3)$number_records[1] == 2)
   expect_equal(sort(cdm$cohort3 %>%
-                      dplyr::pull("subject_id")), c(1, 3, 3, 3, 4))
+                      dplyr::pull("subject_id")), c(1, 1, 1, 2, 2, 3))
   expect_equal(omopgenerics::attrition(cdm$cohort3)$reason[
     omopgenerics::attrition(cdm$cohort3)$cohort_definition_id == 1],
     c("Initial qualifying events", "cohort_start_date >= 2001-01-01", "cohort_end_date <= 2005-01-01")
@@ -142,7 +142,7 @@ test_that("trim cohort dates", {
                     cohortId = 1,
                     name = "cohort4")
   expect_equal(sort(cdm$cohort4 %>% dplyr::pull("cohort_end_date")),
-               as.Date(c("2000-02-12", "2000-03-05", "2000-08-23", "2005-01-01", "2015-02-07", "2015-02-22", "2015-04-17")))
+               as.Date(c("2000-05-27", "2001-09-08", "2002-03-26", "2004-12-11", "2005-01-01", "2007-09-06", "2015-08-12")))
   expect_equal(omopgenerics::attrition(cdm$cohort4)$reason,
                c("Initial qualifying events", "cohort_end_date <= 2005-01-01", "Initial qualifying events")
   )
@@ -152,7 +152,7 @@ test_that("trim cohort dates", {
                     cohortId = 1,
                     name = "cohort5")
   expect_equal(sort(cdm$cohort5 %>% dplyr::pull("cohort_start_date")),
-               as.Date(c("1993-01-06", "2005-01-01", "2015-02-02", "2015-02-08", "2015-02-23", "2015-04-14")))
+               as.Date(c("1999-07-11", "2000-06-17", "2004-12-12", "2005-01-01", "2015-01-25", "2015-02-02")))
   expect_equal(omopgenerics::attrition(cdm$cohort5)$reason,
                c("Initial qualifying events", "cohort_start_date >= 2005-01-01", "Initial qualifying events")
   )
diff --git a/tests/testthat/test-requireDeathFlag.R b/tests/testthat/test-requireDeathFlag.R
index 822a797f..d1ac6c55 100644
--- a/tests/testthat/test-requireDeathFlag.R
+++ b/tests/testthat/test-requireDeathFlag.R
@@ -1,8 +1,8 @@
 test_that("requiring death", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort1"), numberCohorts = 2)
   cdm_local$death <- dplyr::tibble(
     person_id = c(1,3),
@@ -53,10 +53,10 @@ test_that("requiring death", {
                                    cohortId = 1,
                                    window = c(0, 365),
                                    name = "cohort6")
-  expect_true(all(cdm$cohort6 |> dplyr::pull("subject_id") |> sort() %in% c(1, 1, 1, 3, 3)))
+  expect_true(all(cdm$cohort6 |> dplyr::pull("subject_id") |> sort() %in% c(2,2,2,2)))
   expect_true(all(
     cdm$cohort6 |> dplyr::pull("cohort_start_date") |> sort() ==
-      c("2000-06-23", "2001-07-16", "2001-12-04", "2015-03-05", "2015-03-25")
+      c("1999-04-19", "2000-02-04", "2000-03-12", "2000-08-05")
   ))
   expect_true(all(omopgenerics::attrition(cdm$cohort6)$reason ==
                     c("Initial qualifying events",
@@ -77,8 +77,8 @@ test_that("requiring death", {
 test_that("not death", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort1"), numberCohorts = 2, seed = 3)
   cdm_local$death <- dplyr::tibble(
     person_id = c(1,3),
@@ -107,10 +107,10 @@ test_that("not death", {
                                    window = c(0, Inf),
                                    name = "cohort4",
                                    negate = TRUE)
-  expect_true(all(cdm$cohort4 |> dplyr::pull("subject_id") |> sort() == c(1, 1, 2, 4, 4, 4)))
+  expect_true(all(cdm$cohort4 |> dplyr::pull("subject_id") |> sort() == c(1, 1, 1, 2, 4, 4)))
   expect_true(all(
     cdm$cohort4 |> dplyr::pull("cohort_start_date") |> sort() ==
-      c("1990-10-29", "1992-08-05", "1997-04-25", "2000-01-06", "2003-05-31", "2003-07-20")
+      c("1992-02-15", "1992-04-20", "1999-07-17", "2001-09-10", "2002-08-02", "2004-06-18")
   ))
   expect_true(all(omopgenerics::attrition(cdm$cohort4)$reason ==
                     c("Initial qualifying events", "Alive between 0 & Inf days relative to cohort_start_date",
diff --git a/tests/testthat/test-requireDemographics.R b/tests/testthat/test-requireDemographics.R
index 90df5b72..53d303cc 100644
--- a/tests/testthat/test-requireDemographics.R
+++ b/tests/testthat/test-requireDemographics.R
@@ -1,9 +1,9 @@
 test_that("test it works and expected errors", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 10) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort()
+    omock::mockPerson(n = 10, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(seed = 1)
   # to remove in new omock
   cdm_local$person <- cdm_local$person |>
     dplyr::mutate(dplyr::across(dplyr::ends_with("of_birth"), ~ as.numeric(.x)))
@@ -129,17 +129,16 @@ test_that("test it works and expected errors", {
 test_that("restrictions applied to single cohort", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 1) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(recordPerson = 3)
+    omock::mockPerson(n = 1,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(recordPerson = 3,seed = 1)
   # to remove in new omock
   cdm_local$person <- cdm_local$person |>
     dplyr::mutate(dplyr::across(dplyr::ends_with("of_birth"), ~ as.numeric(.x)))
   cdm <- cdm_local |> copyCdm()
-
   cdm$cohort1 <- cdm$cohort %>%
     requireDemographics(ageRange = list(c(0, 5)), name = "cohort1")
-  expect_true("2001-07-30" == cdm$cohort1 %>% dplyr::pull("cohort_start_date"))
+  expect_true(all(c("2001-03-30", "2003-06-15") == cdm$cohort1 %>% dplyr::pull("cohort_start_date")))
   expect_true(all(
     c("Initial qualifying events", "Age requirement: 0 to 5", "Sex requirement: Both",
       "Prior observation requirement: 0 days", "Future observation requirement: 0 days") ==
@@ -176,9 +175,9 @@ test_that("restrictions applied to single cohort", {
 test_that("ignore existing cohort extra variables", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 1) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(recordPerson = 3)
+    omock::mockPerson(n = 1,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(recordPerson = 3,seed = 1)
   # to remove in new omock
   cdm_local$person <- cdm_local$person |>
     dplyr::mutate(dplyr::across(dplyr::ends_with("of_birth"), ~ as.numeric(.x)))
@@ -215,9 +214,9 @@ test_that("ignore existing cohort extra variables", {
 test_that("external columns kept after requireDemographics", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 1) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(recordPerson = 3)
+    omock::mockPerson(n = 1,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(recordPerson = 3,seed = 1)
   cdm_local$cohort <- cdm_local$cohort %>%
     dplyr::mutate(
       col_extra1 = as.numeric(subject_id) + 1,
@@ -240,23 +239,23 @@ test_that("external columns kept after requireDemographics", {
 test_that("cohortIds", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 3) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(numberCohorts = 3)
+    omock::mockPerson(n = 3,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(numberCohorts = 3,seed = 1)
   # to remove in new omock
   cdm_local$person <- cdm_local$person |>
     dplyr::mutate(dplyr::across(dplyr::ends_with("of_birth"), ~ as.numeric(.x)))
   cdm <- cdm_local |> copyCdm()
 
-  cdm$new_cohort <- requireSex(cohort = cdm$cohort, cohortId = 1, sex = "Male") |>
+  cdm$new_cohort <- requireSex(cohort = cdm$cohort, cohortId = 1, sex = "Male", name = "new_cohort") |>
     requirePriorObservation(cohortId = "cohort_3", minPriorObservation = 1000, name = "new_cohort")
   expect_true(all(
     omopgenerics::attrition(cdm$new_cohort)$reason ==
       c("Initial qualifying events", "Sex requirement: Male", "Initial qualifying events" ,
         "Initial qualifying events", "Prior observation requirement: 1000 days")
   ))
-  expect_true(all(cdm$new_cohort |> dplyr::pull("cohort_definition_id") == c(2,2,2,3)))
-  expect_true(all(cdm$new_cohort |> dplyr::pull("subject_id") == c(2,2,2,1)))
+  expect_true(all(cdm$new_cohort |> dplyr::pull("cohort_definition_id") == c(2,2,2)))
+  expect_true(all(cdm$new_cohort |> dplyr::pull("subject_id") == c(1,1,1)))
 
   PatientProfiles::mockDisconnect(cdm)
 })
@@ -264,9 +263,9 @@ test_that("cohortIds", {
 test_that("test more than one restriction", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 3) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(numberCohorts = 3)
+    omock::mockPerson(n = 3,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(numberCohorts = 3,seed = 1)
   # to remove in new omock
   cdm_local$person <- cdm_local$person |>
     dplyr::mutate(dplyr::across(dplyr::ends_with("of_birth"), ~ as.numeric(.x)))
@@ -277,21 +276,21 @@ test_that("test more than one restriction", {
     requireAge(ageRange = list(c(0,19), c(20, 40), c(0, 40)), name = "cohort1")
   expect_true(all(
     cdm$cohort1 |> dplyr::pull("cohort_definition_id") |> sort() ==
-      c(1, 1, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 8, 8, 8, 9, 9)
+      c(1, 1, 2, 2, 2, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 9, 9, 9)
   ))
   expect_true(all(
     cdm$cohort1 |> dplyr::pull("cohort_start_date") |> sort() ==
-      c('1999-08-27', '1999-08-27', '2000-01-07', '2000-01-07', '2000-04-10',
-        '2000-04-10', '2001-02-13', '2001-02-13', '2001-07-30', '2001-07-30',
-        '2003-03-02', '2003-03-02', '2004-01-21', '2004-01-21', '2015-01-25',
-        '2015-01-25', '2015-04-09', '2015-04-09')
+      c("1999-11-16", "1999-11-16", "1999-12-17", "1999-12-17", "1999-12-19",
+        "1999-12-19", "2000-05-15", "2000-05-15", "2000-06-23", "2000-06-23",
+        "2001-07-16", "2001-07-16", "2001-12-04", "2001-12-04", "2003-06-15",
+        "2003-06-15", "2004-09-11", "2004-09-11")
   ))
   expect_true(all(
     cdm$cohort1 |> dplyr::pull("cohort_end_date") |> sort() ==
-      c('2000-04-09', '2000-04-09', '2001-02-12', '2001-02-12', '2001-03-23',
-        '2001-03-23', '2001-07-15', '2001-07-15', '2004-01-20', '2004-01-20',
-        '2004-07-30', '2004-07-30', '2005-05-04', '2005-05-04', '2015-06-16',
-        '2015-06-16', '2015-06-26', '2015-06-26')
+      c("1999-12-18", "1999-12-18", "2000-05-14", "2000-05-14", "2001-02-23",
+        "2001-02-23", "2001-07-15", "2001-07-15", "2001-08-26", "2001-08-26",
+        "2001-12-03", "2001-12-03", "2004-09-10", "2004-09-10", "2005-07-25",
+        "2005-07-25", "2006-09-27", "2006-09-27")
   ))
   expect_true(all(
     attrition(cdm$cohort1)$reason |> sort() ==
@@ -304,7 +303,7 @@ test_that("test more than one restriction", {
   ))
   expect_true(all(
     attrition(cdm$cohort1)$number_records |> sort() ==
-      c(0, 1, 1, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3)
+      c(0, 0, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3)
   ))
   expect_true(all(settings(cdm$cohort1)$age_range |> unique() == c("0_19", "0_40", "20_40")))
   expect_true(all(settings(cdm$cohort1)$cohort_name |> unique() ==
@@ -316,23 +315,25 @@ test_that("test more than one restriction", {
     requireAge(ageRange = list(c(0,19), c(20, 40), c(0, 40), c(0, 150)), name = "cohort2")
   expect_true(all(
     cdm$cohort2 |> dplyr::pull("cohort_definition_id") |> sort() ==
-      c(1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 11, 11, 11, 12, 12)
+      c(1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 5, 5, 5, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 12, 12, 12)
   ))
   expect_true(all(
     cdm$cohort2 |> dplyr::pull("cohort_start_date") |> sort() ==
-      c('1999-08-27', '1999-08-27', '1999-08-27', '2000-01-07', '2000-01-07', '2000-01-07',
-        '2000-04-10', '2000-04-10', '2000-04-10', '2001-02-13', '2001-02-13', '2001-02-13',
-        '2001-07-30', '2001-07-30', '2001-07-30', '2003-03-02', '2003-03-02', '2003-03-02',
-        '2004-01-21', '2004-01-21', '2004-01-21', '2015-01-25', '2015-01-25', '2015-01-25',
-        '2015-04-09', '2015-04-09', '2015-04-09')
+      c("1999-11-16", "1999-11-16", "1999-11-16", "1999-12-17", "1999-12-17",
+        "1999-12-17", "1999-12-19", "1999-12-19", "1999-12-19", "2000-05-15",
+        "2000-05-15", "2000-05-15", "2000-06-23", "2000-06-23", "2000-06-23",
+        "2001-07-16", "2001-07-16", "2001-07-16", "2001-12-04", "2001-12-04",
+        "2001-12-04", "2003-06-15", "2003-06-15", "2003-06-15", "2004-09-11",
+        "2004-09-11", "2004-09-11")
   ))
   expect_true(all(
     cdm$cohort2 |> dplyr::pull("cohort_end_date") |> sort() ==
-      c('2000-04-09', '2000-04-09', '2000-04-09', '2001-02-12', '2001-02-12', '2001-02-12',
-        '2001-03-23', '2001-03-23', '2001-03-23', '2001-07-15', '2001-07-15', '2001-07-15',
-        '2004-01-20', '2004-01-20', '2004-01-20', '2004-07-30', '2004-07-30', '2004-07-30',
-        '2005-05-04', '2005-05-04', '2005-05-04', '2015-06-16', '2015-06-16', '2015-06-16',
-        '2015-06-26', '2015-06-26', '2015-06-26')
+      c("1999-12-18", "1999-12-18", "1999-12-18", "2000-05-14", "2000-05-14",
+        "2000-05-14", "2001-02-23", "2001-02-23", "2001-02-23", "2001-07-15",
+        "2001-07-15", "2001-07-15", "2001-08-26", "2001-08-26", "2001-08-26",
+        "2001-12-03", "2001-12-03", "2001-12-03", "2004-09-10", "2004-09-10",
+        "2004-09-10", "2005-07-25", "2005-07-25", "2005-07-25", "2006-09-27",
+        "2006-09-27", "2006-09-27")
   ))
   expect_true(all(settings(cdm$cohort2)$age_range |> unique() == c("0_150", "0_19", "0_40", "20_40")))
   expect_true(all(colnames(settings(cdm$cohort2)) %in% c("cohort_definition_id", "cohort_name", "age_range")))
@@ -347,8 +348,8 @@ test_that("test more than one restriction", {
 
   # one empty output cohort
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 3) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 3,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(numberCohorts = 3, seed = 4)
   # to remove in new omock
   cdm_local$person <- cdm_local$person |>
@@ -413,8 +414,8 @@ test_that("test more than one restriction", {
 test_that("codelist kept with >1 requirement", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod()
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1)
   # to remove in new omock
   cdm_local$person <- cdm_local$person |>
     dplyr::mutate(dplyr::across(dplyr::ends_with("of_birth"), ~ as.numeric(.x)))
@@ -462,8 +463,8 @@ test_that("codelist kept with >1 requirement", {
 test_that("settings with extra columns", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 3) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 3,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(numberCohorts = 3, seed = 4)
   # to remove in new omock
   cdm_local$person <- cdm_local$person |>
@@ -494,8 +495,8 @@ test_that("settings with extra columns", {
 test_that("requireInteractions", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 3) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 3,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(numberCohorts = 3, seed = 4)
   # to remove in new omock
   cdm_local$person <- cdm_local$person |>
diff --git a/tests/testthat/test-requireIsEntry.R b/tests/testthat/test-requireIsEntry.R
index 179358f6..8bc22eb1 100644
--- a/tests/testthat/test-requireIsEntry.R
+++ b/tests/testthat/test-requireIsEntry.R
@@ -1,9 +1,9 @@
 test_that("test restrict to first entry works", {
   cdm <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 3) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = "cohort1", numberCohorts = 1, recordPerson = 2) |>
-    omock::mockCohort(name = "cohort2", numberCohorts = 2, recordPerson = 2)
+    omock::mockPerson(n = 3, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = "cohort1", numberCohorts = 1, recordPerson = 2,seed = 1) |>
+    omock::mockCohort(name = "cohort2", numberCohorts = 2, recordPerson = 2,seed = 1)
 
   expect_true(all(cdm$cohort1 |> CohortConstructor::requireIsFirstEntry() |>
                     dplyr::pull(cohort_start_date) == c("2001-05-29", "1999-07-30", "2015-01-23")))
@@ -13,19 +13,19 @@ test_that("test restrict to first entry works", {
 
   expect_true(all(cdm$cohort2 |> CohortConstructor::requireIsFirstEntry() |>
                     dplyr::pull(cohort_start_date) ==
-                    c("2001-05-29", "1999-07-30", "2015-01-23", "2002-10-09", "1999-04-16")))
+                    c("2001-05-29", "1999-07-30", "2015-01-23", "2002-10-09", "1999-04-16", "2015-02-22")))
 
   expect_true(all(cdm$cohort2 |> CohortConstructor::requireIsFirstEntry() |>
-                    dplyr::pull(subject_id) == c(1:3, 1:2)))
+                    dplyr::pull(subject_id) == c(1:3, 1:3)))
 
 })
 
 test_that("requireIsFirstEntry, cohortIds & name arguments", {
   testthat::skip_on_cran()
   cdm <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 3) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(numberCohorts = 3, recordPerson = 2)
+    omock::mockPerson(n = 3,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(numberCohorts = 3, recordPerson = 2,seed = 1)
 
   expect_no_error(
     cdm$new_cohort <- CohortConstructor::requireIsFirstEntry(
@@ -45,13 +45,13 @@ test_that("requireIsFirstEntry, cohortIds & name arguments", {
                dplyr::tibble(cohort_definition_id = 1, number_records = 3, number_subjects = 3))
   expect_true(all(cdm$new_cohort |>  dplyr::pull(cohort_start_date) ==
                     c("2001-05-29", "1999-07-30", "2015-01-23", "2002-10-09", "2003-09-12",
-                      "1999-04-16", "2000-03-09", "2000-05-05", "2015-02-22", "2015-03-24",
-                      "2002-09-28", "1999-08-25", "1999-12-14", "1999-12-24")))
+                      "1999-04-16", "2000-03-09", "2000-05-05", "2015-02-22", "2002-09-28",
+                      "1999-08-25", "1999-12-14", "1999-12-24", "2000-04-02", "2000-08-11")))
   expect_true(all(cdm$new_cohort |> dplyr::pull(cohort_end_date) ==
                     c("2002-10-23", "2001-10-02", "2015-02-16", "2003-09-11", "2009-03-19",
-                      "2000-03-08", "2000-05-04", "2001-04-01", "2015-03-23", "2015-06-11",
-                      "2008-10-13", "1999-12-13", "1999-12-23", "2000-04-01")))
-  expect_true(all(cdm$new_cohort |> dplyr::pull(subject_id) == c(1, 2, 3, 1, 1, 2, 2, 2, 3, 3, 1, 2, 2, 2)))
+                      "2000-03-08", "2000-05-04", "2001-04-01", "2015-03-23", "2008-10-13",
+                      "1999-12-13", "1999-12-23", "2000-04-01", "2000-08-10", "2000-09-13")))
+  expect_true(all(cdm$new_cohort |> dplyr::pull(subject_id) == c(1, 2, 3, 1, 1, 2, 2, 2, 3, 1, 2, 2, 2, 2,2)))
   expect_true(all(
     omopgenerics::attrition(cdm$new_cohort)$reason  ==
       c("Initial qualifying events", "Restricted to first entry",
@@ -63,9 +63,9 @@ test_that("requireIsFirstEntry, cohortIds & name arguments", {
 test_that("errors", {
   testthat::skip_on_cran()
   cdm <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 3) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(numberCohorts = 1, recordPerson = 2)
+    omock::mockPerson(n = 3,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(numberCohorts = 1, recordPerson = 2,seed = 1)
 
   expect_error(cdm$cohort |> requireIsFirstEntry(name = 1))
   expect_error(cdm$cohort1 <- cdm$cohort |> requireIsFirstEntry(name = "cohort2"))
@@ -77,9 +77,9 @@ test_that("errors", {
 test_that("requireIsLastEntry", {
   testthat::skip_on_cran()
   cdm <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 3) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(numberCohorts = 3, recordPerson = 2)
+    omock::mockPerson(n = 3,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(numberCohorts = 3, recordPerson = 2,seed = 1)
 
   cdm$new_cohort <- CohortConstructor::requireIsLastEntry(
     cohort = cdm$cohort,
@@ -96,15 +96,15 @@ test_that("requireIsLastEntry", {
   expect_equal(counts_new |> dplyr::filter(cohort_definition_id == 1),
                dplyr::tibble(cohort_definition_id = 1, number_records = 3, number_subjects = 3))
   expect_true(all(cdm$new_cohort |>  dplyr::pull(cohort_start_date) ==
-                    c("2004-01-08", "1999-07-30", "2015-03-11", "2002-10-09", "2003-09-12",
-                      "1999-04-16", "2000-03-09", "2000-05-05", "2015-02-22", "2015-03-24",
-                      "2002-09-28", "1999-08-25", "1999-12-14", "1999-12-24")))
+                    c("2004-01-08", "1999-07-30", "2015-02-17", "2002-10-09", "2003-09-12",
+                      "1999-04-16", "2000-03-09", "2000-05-05", "2015-02-22", "2002-09-28",
+                      "1999-08-25", "1999-12-14", "1999-12-24", "2000-04-02", "2000-08-11")))
   expect_true(all(cdm$new_cohort |> dplyr::pull(cohort_end_date) ==
-                    c("2009-10-03", "2001-10-02", "2015-04-13", "2003-09-11", "2009-03-19",
-                      "2000-03-08", "2000-05-04", "2001-04-01", "2015-03-23", "2015-06-11",
-                      "2008-10-13", "1999-12-13", "1999-12-23", "2000-04-01")))
+                    c("2009-10-03", "2001-10-02", "2015-03-10", "2003-09-11", "2009-03-19",
+                      "2000-03-08", "2000-05-04", "2001-04-01", "2015-03-23", "2008-10-13",
+                      "1999-12-13", "1999-12-23", "2000-04-01", "2000-08-10", "2000-09-13")))
   expect_true(all(cdm$new_cohort |> dplyr::pull(subject_id) ==
-                    c(1, 2, 3, 1, 1, 2, 2, 2, 3, 3, 1, 2, 2, 2)))
+                    c(1, 2, 3, 1, 1, 2, 2, 2, 3, 1, 2, 2, 2, 2, 2)))
   expect_true(all(omopgenerics::attrition(cdm$new_cohort)$reason == c(
     c("Initial qualifying events", "Restricted to last entry", "Initial qualifying events",
       "Initial qualifying events"))
@@ -122,11 +122,11 @@ test_that("requireIsLastEntry", {
 test_that("requireEntry", {
   testthat::skip_on_cran()
   cdm <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 10) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 10,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = "cohort1",
                       numberCohorts = 1,
-                      recordPerson = 4)
+                      recordPerson = 4,seed = 1)
 
   # 1 to inf will leave the cohort table unchanged
   cdm$cohort1_a <- requireIsEntry(
@@ -177,11 +177,12 @@ test_that("requireEntry", {
 
  # mock cohort
  cdm_local <- omock::mockCdmReference() |>
-   omock::mockPerson(n = 10) |>
-   omock::mockObservationPeriod() |>
+   omock::mockPerson(n = 10,seed = 1) |>
+   omock::mockObservationPeriod(seed = 1) |>
    omock::mockCohort(name = "cohort1",
                      numberCohorts = 1,
-                     recordPerson = 4)
+                     recordPerson = 4,
+                     seed = 1)
  cdm <- cdm_local |> copyCdm()
  cdm <- omopgenerics::insertTable(cdm, "observation_period",
                            data.frame(observation_period_id = c(1,2),
diff --git a/tests/testthat/test-requireTableIntersect.R b/tests/testthat/test-requireTableIntersect.R
index 07bca365..917d0bde 100644
--- a/tests/testthat/test-requireTableIntersect.R
+++ b/tests/testthat/test-requireTableIntersect.R
@@ -1,11 +1,11 @@
 test_that("requiring presence in another table", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 2)
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 2,seed = 1)
   cdm_local$table <- dplyr::tibble(
-    person_id = c(1, 3, 4),
+    person_id = c(1, 3, 2),
     date_start = as.Date(c("2002-01-01", "2015-10-01", "2000-01-01")),
     date_end = as.Date(c("2002-01-01", "2015-10-01", "2000-01-01"))
   )
@@ -35,9 +35,9 @@ test_that("requiring presence in another table", {
                                             targetEndDate = "date_end",
                                             window = c(0, Inf),
                                             name = "cohort3")
-  expect_true(all(cdm$cohort3 |> dplyr::pull("subject_id") == c(1, 3, 4, 1, 1, 1, 3)))
+  expect_true(all(cdm$cohort3 |> dplyr::pull("subject_id") == c(2,3,1,1)))
   expect_true(all(cdm$cohort3 |> dplyr::pull("cohort_start_date") ==
-                    c("2001-03-30", "2015-03-25", "1997-10-22", "2000-06-23", "2001-07-16", "2001-12-04", "2015-03-05")))
+                    c("1999-05-03", "2015-02-25", "2001-03-24", "2001-11-28")))
   expect_equal(omopgenerics::attrition(cdm$cohort3)$reason,
                c("Initial qualifying events",
                  "In table table between 0 & Inf days relative to cohort_start_date between 1 and Inf",
@@ -52,8 +52,8 @@ test_that("requiring presence in another table", {
                                             window = c(-Inf, 0),
                                             censorDate = "cohort_end_date",
                                             name = "cohort4")
-  expect_true(cdm$cohort4 |> dplyr::pull("subject_id") == 1)
-  expect_true(cdm$cohort4 |> dplyr::pull("cohort_start_date") == "2003-06-15")
+  expect_true(all(cdm$cohort4 |> dplyr::pull("subject_id") == c(1,1,1,1)))
+  expect_true(all(cdm$cohort4 |> dplyr::pull("cohort_start_date") == c("2003-05-17", "2004-03-11", "2002-01-30", "2002-06-13")))
   expect_equal(omopgenerics::attrition(cdm$cohort4)$reason,
                c("Initial qualifying events",
                  "In table table between -Inf & 0 days relative to cohort_start_date between 1 and Inf, censoring at cohort_end_date",
@@ -69,9 +69,9 @@ test_that("requiring presence in another table", {
                                             window = c(-Inf, 0),
                                             censorDate = "cohort_end_date",
                                             name = "cohort5")
-  expect_true(all(cdm$cohort5 |> dplyr::pull("subject_id") == c(1, 1, 1, 1, 3)))
+  expect_true(all(cdm$cohort5 |> dplyr::pull("subject_id") == c(1, 1, 1, 1, 1,1)))
   expect_true(all(cdm$cohort5 |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("2000-06-23", "2001-07-16", "2001-12-04", "2003-06-15", "2015-03-05")))
+                    c("2001-03-24", "2001-11-28", "2002-01-30", "2002-06-13", "2003-05-17", "2004-03-11")))
   expect_equal(omopgenerics::attrition(cdm$cohort5)$reason,
                c("Initial qualifying events",
                  "In table table between -Inf & 0 days relative to cohort_start_date between 1 and Inf, censoring at cohort_end_date",
@@ -101,9 +101,9 @@ test_that("requiring presence in another table", {
 test_that("requiring absence in another table", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 2)
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 2,seed = 1)
   cdm_local$table <- dplyr::tibble(
     person_id = c(1, 3, 4),
     date_start = as.Date(c("2002-01-01", "2015-10-01", "2000-01-01")),
@@ -119,7 +119,7 @@ test_that("requiring absence in another table", {
                                             window = c(-Inf, Inf),
                                             name = "cohort2")
 
-  expect_true(cdm$cohort2 |> dplyr::pull("subject_id") |> length() == 0)
+  expect_true(cdm$cohort2 |> dplyr::pull("subject_id") |> length() == 1)
   expect_equal(omopgenerics::attrition(cdm$cohort2)$reason,
                c("Initial qualifying events",
                  "Not in table table between -Inf & Inf days relative to cohort_start_date",
@@ -133,8 +133,9 @@ test_that("requiring absence in another table", {
                                             targetEndDate = "date_end",
                                             window = c(0, Inf),
                                             name = "cohort3")
-  expect_true(all(cdm$cohort3 |> dplyr::pull("subject_id") == 1))
-  expect_true(all(cdm$cohort3 |> dplyr::pull("cohort_start_date") == "2003-06-15"))
+  expect_true(all(cdm$cohort3 |> dplyr::pull("subject_id") == c(1,1,2,1,1)))
+  expect_true(all(cdm$cohort3 |> dplyr::pull("cohort_start_date") |> sort() ==
+                    c("1999-05-03", "2002-01-30", "2002-06-13", "2003-05-17", "2004-03-11")))
   expect_equal(omopgenerics::attrition(cdm$cohort3)$reason,
                c("Initial qualifying events",
                  "Not in table table between 0 & Inf days relative to cohort_start_date",
@@ -150,9 +151,9 @@ test_that("requiring absence in another table", {
                                             window = c(-Inf, 0),
                                             censorDate = "cohort_end_date",
                                             name = "cohort4")
-  expect_true(all(cdm$cohort4 |> dplyr::pull("subject_id") == c(1, 3, 4, 1, 1, 1, 3)))
+  expect_true(all(cdm$cohort4 |> dplyr::pull("subject_id") == c(2,3,1,1)))
   expect_true(all((cdm$cohort4 |> dplyr::pull("cohort_start_date") ==
-                 c("2001-03-30", "2015-03-25", "1997-10-22", "2000-06-23", "2001-07-16", "2001-12-04", "2015-03-05"))))
+                 c("1999-05-03", "2015-02-25", "2001-03-24", "2001-11-28"))))
   expect_equal(omopgenerics::attrition(cdm$cohort4)$reason,
                c("Initial qualifying events",
                  "Not in table table between -Inf & 0 days relative to cohort_start_date, censoring at cohort_end_date",
@@ -168,9 +169,10 @@ test_that("requiring absence in another table", {
                                             targetEndDate = "date_end",
                                             window = c(0, Inf),
                                             censorDate = NULL)
-  expect_true(all(cdm$cohort1 |> dplyr::pull("subject_id") |> sort() == c(1, 1, 1, 1, 3)))
+  expect_true(all(cdm$cohort1 |> dplyr::pull("subject_id") |> sort() == c(1, 1, 1, 1, 1, 1, 2)))
   expect_true(all((cdm$cohort1 |> dplyr::pull("cohort_start_date") |> sort() ==
-                     c("2000-06-23", "2001-07-16", "2001-12-04", "2003-06-15", "2015-03-05"))))
+                     c("1999-05-03", "2001-03-24", "2001-11-28", "2002-01-30", "2002-06-13",
+                       "2003-05-17", "2004-03-11"))))
   expect_equal(omopgenerics::attrition(cdm$cohort1)$reason,
                c("Initial qualifying events",
                  "Not in table table between 0 & Inf days relative to cohort_start_date",
diff --git a/tests/testthat/test-sampleCohorts.R b/tests/testthat/test-sampleCohorts.R
index efe2be7a..72581cc2 100644
--- a/tests/testthat/test-sampleCohorts.R
+++ b/tests/testthat/test-sampleCohorts.R
@@ -1,7 +1,7 @@
 test_that("sampleCohort subsetting one cohort", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort1"), numberCohorts = 5, seed = 2)
   cdm <- CDMConnector::copyCdmTo(con = DBI::dbConnect(duckdb::duckdb()),
                                  cdm = cdm_local,
@@ -29,19 +29,19 @@ test_that("sampleCohort subsetting one cohort", {
 
 test_that("sampleCohort subsetting multiple cohorts", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 10) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 10,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort1"), numberCohorts = 3, seed = 2)
   cdm <- CDMConnector::copyCdmTo(con = DBI::dbConnect(duckdb::duckdb()),
                                  cdm = cdm_local,
                                  schema = "main",
                                  overwrite = TRUE)
 
-  cdm$cohort1 <- sampleCohorts(cdm$cohort1, n = 5)
+  cdm$cohort1 <- sampleCohorts(cdm$cohort1, n = 4)
   expect_true(all(attrition(cdm$cohort1) |>
-                dplyr::filter(reason == "Sample 5 individuals") |>
+                dplyr::filter(reason == "Sample 4 individuals") |>
                 dplyr::arrange(cohort_definition_id) |>
-                dplyr::pull("number_subjects") == c(5,5,4)))
+                dplyr::pull("number_subjects") == c(4,4,4)))
 
   # Subset it again but only cohorts 1 and 3
   cdm$cohort2 <- sampleCohorts(cdm$cohort1, c(1,3), 4, name = "cohort2")
@@ -53,15 +53,15 @@ test_that("sampleCohort subsetting multiple cohorts", {
   expect_true(all(attrition(cdm$cohort2) |>
                 dplyr::filter(reason == "Sample 4 individuals") |>
                 dplyr::arrange(cohort_definition_id) |>
-                dplyr::pull("excluded_subjects") == c(1,0)))
+                dplyr::pull("excluded_subjects") == c(1,0,1,2,0)))
 
   PatientProfiles::mockDisconnect(cdm)
 })
 
 test_that("sampleCohort subsetting all cohorts", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort1"), numberCohorts = 3, seed = 2)
   cdm <- CDMConnector::copyCdmTo(con = DBI::dbConnect(duckdb::duckdb()),
                                  cdm = cdm_local,
diff --git a/tests/testthat/test-subsetCohorts.R b/tests/testthat/test-subsetCohorts.R
index 46460ccf..a04222f8 100644
--- a/tests/testthat/test-subsetCohorts.R
+++ b/tests/testthat/test-subsetCohorts.R
@@ -1,7 +1,7 @@
 test_that("subsetCohort works", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort1"), numberCohorts = 5, seed = 2)
   cdm <- cdm_local |> copyCdm()
 
@@ -48,9 +48,9 @@ test_that("subsetCohort works", {
 test_that("codelist works", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort()
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(seed = 1)
   cdm_local$concept <- dplyr::tibble(
     "concept_id" = c(1, 2, 3),
     "concept_name" = c("my concept 1", "my concept 2", "my concept 3"),
@@ -97,8 +97,8 @@ test_that("codelist works", {
 test_that("Expected behaviour", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort1"), numberCohorts = 5, seed = 2)
   cdm <- cdm_local |> copyCdm()
 
diff --git a/tests/testthat/test-trimDemographics.R b/tests/testthat/test-trimDemographics.R
index 880c0230..cd9ce56c 100644
--- a/tests/testthat/test-trimDemographics.R
+++ b/tests/testthat/test-trimDemographics.R
@@ -328,7 +328,8 @@ test_that("cohort Id, name, additional columns", {
   testthat::skip_on_cran()
   cdm <- mockCohortConstructor(nPerson = 5,
                                con = connection(),
-                               writeSchema = writeSchema())
+                               writeSchema = writeSchema(),
+                               seed = 1)
   cdm$cohort2 <- cdm$cohort2 |>
     dplyr::mutate(
       col_extra1 = as.numeric(subject_id) + 1,
@@ -352,9 +353,9 @@ test_that("cohort Id, name, additional columns", {
   expect_equal(
     x1,
     dplyr::tibble(
-      subject_id = c(1, 1, 2, 3, 5) |> as.integer(),
-      cohort_start_date = as.Date(c("2001-04-03", "2002-05-07", "1999-07-26", "2015-02-19", "2012-06-12")),
-      cohort_end_date = as.Date(c("2002-05-06", "2005-11-07", "2002-09-17", "2015-06-27", "2012-09-09"))
+      subject_id = c(1, 1, 2, 3) |> as.integer(),
+      cohort_start_date = as.Date(c("2001-04-03", "2002-05-07", "1999-07-26", "2015-02-19")),
+      cohort_end_date = as.Date(c("2002-05-06", "2005-11-07", "2002-09-17", "2015-06-27"))
     )
   )
   expect_equal(
diff --git a/tests/testthat/test-unionCohorts.R b/tests/testthat/test-unionCohorts.R
index 597ac0d8..1d92588b 100644
--- a/tests/testthat/test-unionCohorts.R
+++ b/tests/testthat/test-unionCohorts.R
@@ -1,27 +1,27 @@
 test_that("unionCohorts works", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 4)
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 4, seed = 1)
   cdm <- cdm_local |> copyCdm()
    # simple example
   cdm$cohort2 <- unionCohorts(cdm$cohort1, name = "cohort2")
   expect_true(all(
     cdm$cohort2 %>% dplyr::pull("cohort_start_date") %>% sort() ==
-      c("1994-02-19", "1999-08-24", "2000-06-23", "2015-01-19")
+      c("1999-05-03", "2001-03-24", "2015-01-22")
   ))
   expect_true(all(
     cdm$cohort2 %>% dplyr::pull("cohort_end_date") %>% sort() ==
-      c("2001-08-26", "2006-09-27", "2007-08-06", "2015-09-14")
+      c("2002-06-07", "2009-06-12", "2015-06-22")
   ))
   expect_true(all(
-    cdm$cohort2 %>% dplyr::pull("subject_id") %>% sort() == 1:4
+    cdm$cohort2 %>% dplyr::pull("subject_id") %>% sort() == 1:3
   ))
   expect_true(all(attrition(cdm$cohort2) ==
                     dplyr::tibble(
                       cohort_definition_id = 1,
-                      number_records = 4,
-                      number_subjects = 4,
+                      number_records = 3,
+                      number_subjects = 3,
                       reason_id = 1,
                       reason = "Initial qualifying events",
                       excluded_records = 0,
@@ -33,20 +33,20 @@ test_that("unionCohorts works", {
   cdm$cohort3 <- unionCohorts(cdm$cohort1, cohortId = 1:2, name = "cohort3")
   expect_true(all(
     cdm$cohort3 %>% dplyr::pull("cohort_start_date") %>% sort() ==
-      c("1997-10-22", "2000-06-23", "2015-03-05")
+      c("1999-05-03", "2001-03-24", "2001-11-28", "2002-01-30", "2002-06-13", "2015-02-25")
   ))
   expect_true(all(
     cdm$cohort3 %>% dplyr::pull("cohort_end_date") %>% sort() ==
-      c("1999-05-28", "2006-09-27", "2015-07-06")
+      c("2001-06-15", "2001-11-27", "2002-01-29", "2002-06-12", "2005-07-19", "2015-04-30")
   ))
   expect_true(all(
-    cdm$cohort3 %>% dplyr::pull("subject_id") %>% sort() == c(1, 3, 4)
+    cdm$cohort3 %>% dplyr::pull("subject_id") %>% sort() == c(1, 1, 1, 1, 2, 3)
   ))
   expect_true(all(
     attrition(cdm$cohort3) ==
       dplyr::tibble(
         cohort_definition_id = 1,
-        number_records = 3,
+        number_records = 6,
         number_subjects = 3,
         reason_id = 1,
         reason = "Initial qualifying events",
@@ -73,8 +73,8 @@ test_that("unionCohorts works", {
 
 test_that("gap and name works", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort"), numberCohorts = 4, seed = 11, recordPerson = 2)
   cdm_local$cohort <- cdm_local$cohort |>
     dplyr::arrange(.data$subject_id, .data$cohort_start_date) |>
@@ -120,21 +120,21 @@ test_that("gap and name works", {
   cdm$cohort <- unionCohorts(cdm$cohort, gap = 2,  cohortName = "test")
   expect_true(all(
     cdm$cohort %>% dplyr::pull("cohort_start_date") %>% sort() ==
-      c("1991-10-17", "1991-12-11", "1993-02-17", "1999-04-12", "1999-08-23",
-        "1999-09-19", "2001-12-27", "2015-03-02", "2015-03-17")
+      c("1991-07-14", "1991-10-21", "1995-01-27", "1999-07-26", "1999-08-22",
+        "2002-08-29", "2003-02-07", "2015-02-04", "2015-02-16", "2015-03-07")
   ))
   expect_true(all(
     cdm$cohort %>% dplyr::pull("cohort_end_date") %>% sort() ==
-      c("1991-10-19", "1992-10-12", "1999-07-18", "1999-08-24", "2001-03-19",
-        "2001-06-05", "2008-08-28", "2015-03-09", "2015-03-25")
+      c("1991-08-14", "1994-05-05", "1995-09-11", "1999-08-15", "2001-07-23",
+        "2002-12-29", "2007-06-11", "2015-02-12", "2015-02-26", "2015-07-28")
   ))
   expect_true(all(
-    cdm$cohort %>% dplyr::pull("subject_id") %>% sort() == c(1, rep(2, 3), rep(3, 2), rep(4, 3))
+    cdm$cohort %>% dplyr::pull("subject_id") %>% sort() == c(1, 1, rep(2, 2), rep(3, 3), rep(4, 3))
   ))
   expect_true(all(attrition(cdm$cohort) ==
                     dplyr::tibble(
                       cohort_definition_id = 1,
-                      number_records = 9,
+                      number_records = 10,
                       number_subjects = 4,
                       reason_id = 1,
                       reason = "Initial qualifying events",
@@ -149,8 +149,8 @@ test_that("gap and name works", {
 test_that("Expected behaviour", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
     omock::mockCohort(name = c("cohort"), numberCohorts = 4, seed = 8, recordPerson = 2)
   cdm <- cdm_local |> copyCdm()
   expect_error(
@@ -202,9 +202,9 @@ test_that("Expected behaviour", {
 test_that("test codelist", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort()
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(seed = 1)
   cdm_local$concept <- dplyr::tibble(
     "concept_id" = c(1, 2, 3),
     "concept_name" = c("my concept 1", "my concept 2", "my concept 3"),
@@ -258,14 +258,14 @@ test_that("test codelist", {
   cdm$cohort4 <- unionCohorts(cdm$cohort3, name = "cohort4")
   expect_true(all(
     cdm$cohort4 %>% dplyr::pull("cohort_start_date") %>% sort() ==
-      c("1997-10-22", "2001-03-30", "2003-06-15", "2009-12-22", "2010-01-01", "2010-01-11", "2010-05-31", "2012-09-27", "2014-12-06", "2015-03-25")
+      c("1999-05-03", "2003-05-17", "2004-03-11", "2009-12-22", "2010-01-01", "2010-01-11", "2010-05-31", "2012-09-27", "2014-12-06", "2015-02-25")
   ))
   expect_true(all(
     cdm$cohort4 %>% dplyr::pull("cohort_end_date") %>% sort() ==
-      c("1999-05-28", "2003-06-14", "2005-11-23", "2010-05-04", "2011-08-24", "2014-02-09", "2014-05-20", "2014-12-10", "2015-04-14", "2015-06-24")
+      c("2001-06-15", "2004-03-10", "2005-07-19", "2010-05-04", "2011-08-24", "2014-02-09", "2014-05-20", "2014-12-10", "2015-04-30", "2015-06-24")
   ))
   expect_true(all(
-    cdm$cohort4 %>% dplyr::pull("subject_id") %>% sort() == c(1, 1, 1, 1, 2, 3, 3, 3, 4, 4)
+    cdm$cohort4 %>% dplyr::pull("subject_id") %>% sort() == c(1, 1, 1, 1, 2, 2, 3, 3, 3, 4)
   ))
   codes <- attr(cdm$cohort4, "cohort_codelist")
   expect_true(all(codes |> dplyr::pull("codelist_name") |> sort() == c(rep("c1", 2), "c2")))
@@ -278,9 +278,9 @@ test_that("test codelist", {
 
 test_that("keep original cohorts", {
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort1"), numberCohorts = 4)
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort1"), numberCohorts = 4,seed = 1)
   cdm <- cdm_local |> copyCdm()
 
   start_settings <- settings(cdm$cohort1)
diff --git a/tests/testthat/test-yearCohorts.R b/tests/testthat/test-yearCohorts.R
index 4170df30..9c5a07b6 100644
--- a/tests/testthat/test-yearCohorts.R
+++ b/tests/testthat/test-yearCohorts.R
@@ -1,9 +1,9 @@
 test_that("yearCohorts - change name", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort"))
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort"),seed = 1)
   cdm <- cdm_local |> copyCdm()
 
   # simple example
@@ -20,11 +20,11 @@ test_that("yearCohorts - change name", {
                  target_cohort_name = "cohort_1"
                ))
   expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_start_date") |> sort() ==
-      c("1997-10-22", "1998-01-01", "1999-01-01", "2001-03-30", "2002-01-01")))
+      c("1999-05-03", "2000-01-01", "2001-01-01")))
   expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_end_date") |> sort() ==
-      c("1997-12-31", "1998-12-31", "1999-05-28", "2001-12-31", "2002-12-31")))
-  expect_true(all(cdm$cohort1 |> dplyr::pull("subject_id") |> sort() == c(1, 1, 4, 4, 4)))
-  expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_definition_id") |> sort() == c(1:3, 5:6)))
+      c("1999-12-31", "2000-12-31", "2001-06-15")))
+  expect_true(all(cdm$cohort1 |> dplyr::pull("subject_id") |> sort() == c(2,2,2)))
+  expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_definition_id") |> sort() == c(3,4,5)))
   expect_true(all(attrition(cdm$cohort1)$reason == c(
     'Initial qualifying events', 'Restrict to observations between: 1997-01-01 and 1997-12-31',
     'Initial qualifying events', 'Restrict to observations between: 1998-01-01 and 1998-12-31',
@@ -36,9 +36,9 @@ test_that("yearCohorts - change name", {
 
  # more than 1 cohort
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort"), numberCohorts = 3)
+    omock::mockPerson(n = 4,seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort"), numberCohorts = 3, seed = 1)
   cdm <- cdm_local |> copyCdm()
   # all cohorts
   cdm$cohort1 <- yearCohorts(cohort = cdm$cohort,
@@ -58,11 +58,11 @@ test_that("yearCohorts - change name", {
                  target_cohort_name = rep(paste0("cohort_", 1:3), 4)
                ))
   expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("2005-01-01", "2005-01-01", "2005-01-01", "2006-01-01", "2006-01-01", "2007-01-01")))
+                    c("2005-01-01", "2005-01-01", "2005-01-01", "2006-01-01", "2007-01-01")))
   expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_end_date") |> sort() ==
-                    c("2005-11-23", "2005-12-31", "2005-12-31", "2006-09-27", "2006-12-31", "2007-08-06")))
-  expect_true(all(cdm$cohort1 |> dplyr::pull("subject_id") |> sort() == c(1, 1, 1, 4, 4, 4)))
-  expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_definition_id") |> sort() == c(1:3, 5:6, 9)))
+                    c("2005-01-15", "2005-07-19", "2005-12-31", "2006-12-31", "2007-01-17")))
+  expect_true(all(cdm$cohort1 |> dplyr::pull("subject_id") |> sort() == c(1, 1, 1, 1, 1)))
+  expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_definition_id") |> sort() == c(1, 2, 3, 6, 9)))
   expect_true(all(attrition(cdm$cohort1)$reason == c(
     'Initial qualifying events', 'Restrict to observations between: 2005-01-01 and 2005-12-31',
     'Initial qualifying events', 'Restrict to observations between: 2005-01-01 and 2005-12-31',
@@ -77,7 +77,7 @@ test_that("yearCohorts - change name", {
     'Initial qualifying events', 'Restrict to observations between: 2008-01-01 and 2008-12-31',
     'Initial qualifying events', 'Restrict to observations between: 2008-01-01 and 2008-12-31'
   )))
-  expect_true(all(cohortCount(cdm$cohort1)$number_records == c(1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0)))
+  expect_true(all(cohortCount(cdm$cohort1)$number_records == c(1, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0)))
 
   # just 1 cohort
   cdm$cohort1 <- yearCohorts(cohort = cdm$cohort,
@@ -97,7 +97,7 @@ test_that("yearCohorts - change name", {
   expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_start_date") |> sort() ==
                     c("2005-01-01")))
   expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_end_date") |> sort() ==
-                    c("2005-11-23")))
+                    c("2005-07-19")))
   expect_true(all(cdm$cohort1 |> dplyr::pull("subject_id") |> sort() == 1))
   expect_true(all(cdm$cohort1 |> dplyr::pull("cohort_definition_id") |> sort() == 1))
   expect_true(all(attrition(cdm$cohort1)$reason == c(
@@ -121,9 +121,9 @@ test_that("yearCohorts - change name", {
 test_that("yearCohorts - keep name", {
   testthat::skip_on_cran()
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort"))
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort"), seed = 1)
   cdm <- cdm_local |> copyCdm()
 
   # simple example
@@ -139,11 +139,11 @@ test_that("yearCohorts - keep name", {
                  target_cohort_name = "cohort_1"
                ))
   expect_true(all(cdm$cohort |> dplyr::pull("cohort_start_date") |> sort() ==
-                    c("1997-10-22", "1998-01-01", "1999-01-01", "2001-03-30", "2002-01-01")))
+                    c("1999-05-03", "2000-01-01", "2001-01-01")))
   expect_true(all(cdm$cohort |> dplyr::pull("cohort_end_date") |> sort() ==
-                    c("1997-12-31", "1998-12-31", "1999-05-28", "2001-12-31", "2002-12-31")))
-  expect_true(all(cdm$cohort |> dplyr::pull("subject_id") |> sort() == c(1, 1, 4, 4, 4)))
-  expect_true(all(cdm$cohort |> dplyr::pull("cohort_definition_id") |> sort() == c(1:3, 5:6)))
+                    c("1999-12-31", "2000-12-31", "2001-06-15")))
+  expect_true(all(cdm$cohort |> dplyr::pull("subject_id") |> sort() == c(2, 2, 2)))
+  expect_true(all(cdm$cohort |> dplyr::pull("cohort_definition_id") |> sort() == c(3, 4, 5)))
   expect_true(all(attrition(cdm$cohort)$reason == c(
     'Initial qualifying events', 'Restrict to observations between: 1997-01-01 and 1997-12-31',
     'Initial qualifying events', 'Restrict to observations between: 1998-01-01 and 1998-12-31',
@@ -155,9 +155,9 @@ test_that("yearCohorts - keep name", {
 
   # more than 1 cohort
   cdm_local <- omock::mockCdmReference() |>
-    omock::mockPerson(n = 4) |>
-    omock::mockObservationPeriod() |>
-    omock::mockCohort(name = c("cohort"), numberCohorts = 3)
+    omock::mockPerson(n = 4, seed = 1) |>
+    omock::mockObservationPeriod(seed = 1) |>
+    omock::mockCohort(name = c("cohort"), numberCohorts = 3, seed = 1)
   cdm <- cdm_local |> copyCdm()
 
   # just 1 cohort
@@ -177,7 +177,7 @@ test_that("yearCohorts - keep name", {
   expect_true(all(cdm$cohort |> dplyr::pull("cohort_start_date") |> sort() ==
                     c("2005-01-01")))
   expect_true(all(cdm$cohort |> dplyr::pull("cohort_end_date") |> sort() ==
-                    c("2005-11-23")))
+                    c("2005-07-19")))
   expect_true(all(cdm$cohort |> dplyr::pull("subject_id") |> sort() == c(1)))
   expect_true(all(cdm$cohort |> dplyr::pull("cohort_definition_id") |> sort() == c(1)))
   expect_true(all(attrition(cdm$cohort)$reason == c(
diff --git a/vignettes/a07_filter_cohorts.Rmd b/vignettes/a07_filter_cohorts.Rmd
index f2fc2d18..db30b2f0 100644
--- a/vignettes/a07_filter_cohorts.Rmd
+++ b/vignettes/a07_filter_cohorts.Rmd
@@ -1,8 +1,8 @@
 ---
-title: "a06_filter_cohorts"
+title: "Filter Cohorts"
 output: rmarkdown::html_vignette
 vignette: >
-  %\VignetteIndexEntry{a06_filter_cohorts}
+  %\VignetteIndexEntry{a07_filter_cohorts}
   %\VignetteEngine{knitr::rmarkdown}
   %\VignetteEncoding{UTF-8}
 ---
@@ -16,4 +16,47 @@ knitr::opts_chunk$set(
 
 ```{r setup}
 library(CohortConstructor)
+library(CohortCharacteristics)
+library(ggplot2)
+```
+
+```{r, include = FALSE}
+knitr::opts_chunk$set(
+  collapse = TRUE,
+  eval = TRUE, message = FALSE, warning = FALSE,
+  comment = "#>"
+)
+
+library(CDMConnector)
+library(dplyr, warn.conflicts = FALSE)
+
+if (Sys.getenv("EUNOMIA_DATA_FOLDER") == ""){
+  Sys.setenv("EUNOMIA_DATA_FOLDER" = file.path(tempdir(), "eunomia"))}
+if (!dir.exists(Sys.getenv("EUNOMIA_DATA_FOLDER"))){ dir.create(Sys.getenv("EUNOMIA_DATA_FOLDER"))
+  downloadEunomiaData()  
+}
+```
+
+For this example we'll use the Eunomia synthetic data from the CDMConnector package.
+
+```{r}
+con <- DBI::dbConnect(duckdb::duckdb(), dbdir = eunomia_dir())
+cdm <- cdm_from_con(con, cdm_schema = "main", 
+                    write_schema = c(prefix = "my_study_", schema = "main"))
+```
+
+Let's start by creating two drug cohorts, one for users of diclofenac and another for users of acetaminophen.
+
+```{r}
+cdm$medications <- conceptCohort(cdm = cdm, 
+                                 conceptSet = list("diclofenac" = 1124300,
+                                                   "acetaminophen" = 1127433), 
+                                 name = "medications")
+cohortCount(cdm$medications)
+```
+
+```{r}
+cdm$medications_sample <- sampleCohorts(cdm$medications,cohortId = 1, n = 100, name = "medications_sample")
+
+cohortCount(cdm$medications_sample)
 ```