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Variable Schema

  1. CRF abbreviation: case insensitive, no numbers (optional)
  2. Underscore _   
  3. Question number (2 digits or characters, use 0 placeholder)      
  4. Underscore _      
  5. Sub-question number (2 digits or characters, use 0 placeholder)      
  6. Underscore _      
  7. Short descriptor <=10 characters, can use camel case      
  8. Underscore _      
  9. Optional descriptor modifiers 
    1. Subject identifier (important if mother, child, father connected by same study ID)      
      1. mo = mother     
      2. fo = father     
      3. ch = child
      4. pa = parent /caregiver
    2. Variable type       
      1. bn = binary (0,1) 
      2. yn = yes no
      3. sp= specify (free text) 
      4. dt = date
      5. dttm = date and time
  10. Underscore _ 
  11. Event identifier      
    1. nA = Antenatal e.g. A, 20A, 36A : antenatal, 20 weeks antenatal, 36 weeks antenatal      
    2. B = Birth      
    3. nW= where n is a digit and W is weeks      
    4. nM = where n is a digit and M is Months      
    5. nY = where n  is a number  and Y is year 

Variables should be limited to 28 characters so that a suffix or prefix can still be added. Do not include the unit of measure in the variable name (will be specified in study procedures).


CRF label

Description

haf

Home and family questionnaire

dgr

Demographics

rnd

Randomisation, eligibility

pd

Paediatric examination

ef

Executive function battery

bse

Bayley social emotional questionnaire

dxa

DXA

bys

Bayley III scores

sdqp

Strengths and Difficulty Questionnaire, parent

sdqt

Strengths and Difficulty Questionnaire, teacher

brfpa

BRIEF, parent

brfte

BRIEF, teacher 

brfp

BRIEF-P (preschool) 

scq

Social communication questionnaire

phx

Past medical history

ffq

Food frequency questionnaire

ifq

Infant feeding history questionnaire

cat

Cognitive adaptive test

ath

Anthropometry

asq

Ages and stages questionnaire

trk

Tracking

ech

Echocardiography

grw

Growth

fld

Fluids

ant

Antenatal

bth

Birth

rsu

Resuscitation

lab

Laboratory

cus

Cranial ultrasound

sae

Serious adverse events form

neo

Neonatal outcomes

bry

Beery 

aq

AQ (Autism questionnaire), child

abc

Movement ABC-2 

vis

Vision 

edu

Education

wdr

Withdrawal

pdv

Protocol deviations

con

Contacts

sc

Screening

cs

Consent

rg

Registration

dc

Discharge

echo

Echocardiography

Event label

Description

Bk

Booking

W

Week

A

Antenatal week

B

Birth

PN

Postnatal week

N

Neonatal week

P

pregnancy

BP

before pregnancy

bs

baseline

M

month

D

day

y

year

R

Randomisation

Values Group

Description

ys / yu / no / un

yes successful / yes unsuccessful / no

m / f / i

male / female / indeterminate (intersex)

un

unknown

in / ex

include / exclude 

1/0

 binary fields (1=yes)



Values must always be in lower case.


Variable label

Description

Group

wt

weight

anthropometry

circ

circumference

anthropometry

hc

head circumference

anthropometry

hd

head

anthropometry

ht

height

anthropometry

lg

length

anthropometry

muac

mid upper arm circumference

anthropometry

sga

small for gestational age

anthropometry

adc

abdominal circumference

anthropometry

chc

chest circumference

anthropometry

acr

acromioradiale

anthropometry

tricepsf

triceps skinfold

anthropometry

subscapsf

subscapular skinfold

anthropometry

supiliacsf

suprailiac skinfold

anthropometry

bp

blood pressure

cardiovascular

dias

diastolic

cardiovascular

htn

chronic hypertension (pregestational)

cardiovascular

sys

systolic

cardiovascular

age

age

demographic

dob

date of birth

demographic

edd

estimated date of delivery

demographic

educat

education

demographic

elec

elective

demographic

emply

employment

demographic

eth

ethnicity

demographic

ga

gestation

demographic

pma

postmenstrual age

demographic

NHI

national health index

demographic

sex

sex

demographic

StudyID

Study number

demographic

dis

disease

disease

DM

diabetes melitus

disease

infect

infection

disease

rx

treatment

disease

etoh

alcohol

drugs

meds

medications

drugs

smokg

smoking

drugs

antibody

antibody

misc

grp

group

misc

med

medical

misc

num

number

misc

pc

percentile

misc

prob

problem

misc

date

date 

misc 

stat

status 

misc 

lt

left

misc

rt

right

misc

wk

week

time

hr

hour

time

sec

second

time

day

day

time

aph

antepartum haemorrhage

obstetric

grav

gravidity

obstetric

par

parity

obstetric

pet

preeclampsia

obstetric

prem

preterm

obstetric

ptb

preterm birth

obstetric

thrmc

threatened miscarriage

obstetric

top

termination of pregnancy

obstetric

infert

infertility

obstetric

gahtn

gestational hypertension 

 obstetric

hellp

HELLP syndrome

obstetric

rom18h

ruptured membranes >18 hours

obstetric

mgs04

magnesium sulphate

obstetric

acs

antenatal corticosteroids

obstetric

acsrpt

repeat antenatal corticosteroids

obstetric

labr

labour

obstetric

birthmode

mode of birth

obstetric

ga

gestational age at birth

obstetric

pma

weeks post LMP

obstetric







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