Capitalization of Units of Measure

[pszolovits]

This not earthshaking but I notice that examining the uses of units of measure in MIMIC-IV, there is considerable inconsistency in how these are capitalized. For example, in chartevents, milliliters are represented as "mL", but milliliters per minute are "ml/min". By contrast, in labevents, milliliters per minute are "mL/min". Below is the comprehensive list of units of measure used in chartevents and labevents in MIMIC-IV v2.2.

MariaDB [mimic4v22]> select binary valueuom, count(*) n from labevents group by binary valueuom order by valueuom;

binary valueuom	n
NULL	17991766
#/hpf	1513831
#/lpf	122293
#/uL	292835
%	16868943
+/-	63684
/hpf	306103
/mm3	3
BU	1
EU/dL	8919
fL	4532801
g/dL	5729746
GPL	2506
hrs	625
IU/L	4943774
IU/mL	25520
K/uL	9029635
L/min	9320
log10 cop/mL	1564
log10 copies/mL	2232
log10 IU/mL	14085
m/uL	3190494
mEq/L	16935016
mg/24hr	14607
mg/dL	22812951
mg/g	54967
mg/L	156300
mg/mg	46472
min	66
mIU/mL	49561
mL	11192
mL/min	625
mm Hg	1036214
mm/hr	60481
mmol/L	796306
mOsm/kg	90755
MPL	2506
N/A	1606801
ng/dL	138087
ng/mL	1157605
ng/mL DDU	39
ng/mL FEU	9592
nmol/L	7036
pg	3167073
pg/mL	232519
Pos/Neg	545
Ratio	316483
Score	48
sec	2662566
U	2106
U/g/Hb	2557
U/L	273
U/mL	32919
ug/dL	278831
ug/mL	236261
uIU/mL	316306
umol/L	14807
units	1270125
uU/ML	89

MariaDB [mimic4v22]> select binary valueuom, count(*) n from chartevents group by binary valueuom order by valueuom;

binary valueuom	n
NULL	236702276
#/uL	696
%	9312983
/min	6579
bpm	7827348
cm	968376
cmH2O	3351546
cmH2O/L/seconds	173637
Degree	77
dynes*sec/cm5	2647
dynes*sec/cm5/m2	3087
dynes.sec.cm-5/m2	3620
g/dL	58054
g/dl	428841
g/kg	450
hour	1717
Inch	33707
insp/min	9642142
IU/L	473024
K/uL	877493
kcal/day	1
kcal/kg	477
kg	277540
L/min	2819673
L/min/m2	15070
lbs	1462
Liters	1606
mA	138292
mEq/L	3064966
mg/dL	2781756
mg/L	2747
min	44066
mL	2662414
mL/beat	20836
ml/hr	993580
ml/kg	2376
mL/m2	6380
ml/min	242012
mm/hr	916
mmHg	25401973
mmHg.	19059
mmol/L	448477
mOsm/kg	22412
msec	415
mV	98445
ng/mL	111153
pg/mL	3808
ppm	1290
psi	927
RPM	15444
sec	1524360
ug/dL	5698
ug/mL	44789
umol/L	1615
units	525828
years	26
°C	958887
°F	1515987