Convert raw anthropometric measurement (weight, height, length, BMI, MUAC, head circumeference, tricep skinfold and subscapular skinfold) to z-scores, using the WHO growth standards (0-5 years) and/or references (5-19 years).
Also allows the ‘reverse’ calculation of original anthropometry measures from z-scores (requires further testing).
You can install whozr from github with:
# install.packages("remotes")
remotes::install_github("simisc/whozr")library(dplyr) # tibble(), mutate()
library(knitr) # kable()
library(whozr) # zwa(), zla(), zwl()tibble(
sex = c("F", "M", "M", "F"),
age_days = c(120, 310, 370, 460),
weight_kg = c(5.98, 8.09, 8.40, 8.46),
length_cm = c(60.2, 70.7, 72.6, 74.9)
) |>
mutate(
waz = zwa(weight_kg, age_days, sex),
laz = zla(length_cm, age_days, sex),
wlz = zwl(weight_kg, length_cm, sex)
) |>
kable(digits = 3)| sex | age_days | weight_kg | length_cm | waz | laz | wlz |
|---|---|---|---|---|---|---|
| F | 120 | 5.98 | 60.2 | -0.539 | -0.818 | 0.101 |
| M | 310 | 8.09 | 70.7 | -1.186 | -1.229 | -0.723 |
| M | 370 | 8.40 | 72.6 | -1.296 | -1.398 | -0.846 |
| F | 460 | 8.46 | 74.9 | -1.065 | -0.996 | -0.859 |