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Variable Schema

  1. CRF abbreviation:

...

  1.  case insensitive, no numbers (optional)
  2. Underscore _   
  3. Question number

...

  1. (2 digits

...

  1. or characters, use 0

...

  1. placeholder)      
  2. Underscore _      
  3. Sub-question number (2 digits or characters, use 0 placeholder)      
  4. Underscore _      
  5. Short descriptor <=10 characters, can use camel case      
  6. Underscore _      
  7. Optional descriptor modifiers 
    1. Subject identifier (

...

    1. important if mother, child, father connected by same study ID)      

    ...

        1. mo = mother     

    ...

        1. fo = father     

    ...

        1. ch = child
        2. pa = parent /caregiver
      1. Variable type       
        1. bn = binary (0,1) 
        2. yn = yes no
        3. sp= specify (free text) 
        4. dt = date
        5. dttm = date and time
    1. Underscore _ 
    2. 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 labelDescription
    hafHome and family questionnaire
    dgrDemographics
    rndRandomisation, eligibility

    ...

    pdPaediatric examination
    efExecutive function battery
    bseBayley social emotional questionnaire
    dxaDXA
    bysBayley III scores

    ...

    sdqpStrengths and Difficulty Questionnaire

    ...

    , parent
    sdqtStrengths and Difficulty Questionnaire, teacher
    brfpaBRIEF, parent
    brfteBRIEF, teacher 
    brfpBRIEF-P (preschool) 
    scqSocial communication questionnaire
    phxPast medical history
    ffqFood frequency questionnaire
    ifqInfant feeding history questionnaire
    catCognitive adaptive test
    athAnthropometry
    asqAges and stages questionnaire
    trkTracking
    echEchocardiography
    grwGrowth
    fldFluids
    antAntenatal
    bthBirth
    rsuResuscitation
    labLaboratory
    cusCranial ultrasound
    saeSerious adverse events form

    ...

    neoNeonatal outcomes
    bryBeery 
    aqAQ (Autism questionnaire), child
    abcMovement ABC-2 
    visVision 
    eduEducation
    wdrWithdrawal
    pdvProtocol deviations
    conContacts
    scScreening
    csConsent
    rgRegistration
    dcDischarge
    echoEchocardiography

     


     

    Event label

    ...

    Description
    BkBooking
    WWeek
    AAntenatal week
    BBirth
    PNPostnatal week
    NNeonatal week
    Ppregnancy
    BPbefore pregnancy
    bsbaseline
    Mmonth
    Dday
    yyear
    RRandomisation

     


     

    Values GroupDescription
    ys / yu / no / unyes successful / yes unsuccessful / no
    m / f / i

    male / female / indeterminate (intersex)

    ununknown
    in / exinclude / exclude 
    1/0 binary fields (1=yes)
      

    Values must always be in lower case.

     


     

    Variable labelDecriptionGroup
    wtweightanthropometry
    circcircumferenceanthropometry
    hchead circumferenceanthropometry
    hdheadanthropometry
    htheightanthropometry
    lglengthanthropometry
    muacmid upper arm circumferenceanthropometry
    sgasmall for gestational ageanthropometry
    adcabdominal circumferenceanthropometry
    chcchest circumferenceanthropometry
    acracromioradialeanthropometry
    tricepsftriceps skinfoldanthropometry
    subscapsfsubscapular skinfoldanthropometry
    supiliacsfsuprailiac skinfoldanthropometry
    bpblood pressurecardiovascular
    diasdiastoliccardiovascular
    htnchronic hypertension (pregestational)cardiovascular
    syssystoliccardiovascular
    ageagedemographic
    dobdate of birthdemographic
    eddestimated date of deliverydemographic
    educateducationdemographic
    elecelectivedemographic
    emplyemploymentdemographic
    ethethnicitydemographic
    gagestationdemographic
    pmapostmenstrual agedemographic
    NHInational health indexdemographic
    sexsexdemographic
    StudyIDStudy numberdemographic
    disdiseasedisease
    DMdiabetes melitusdisease
    infectinfectiondisease
    rxtreatmentdisease
    etohalcoholdrugs
    medsmedicationsdrugs
    smokgsmokingdrugs
    antibodyantibodymisc
    grpgroupmisc
    medmedicalmisc
    numnumbermisc
    pcpercentilemisc
    probproblemmisc
    datedate misc 
    statstatus misc 
    ltleftmisc
    rtrightmisc
    wkweektime
    hrhourtime
    secsecondtime
    daydaytime
    aphantepartum haemorrhageobstetric
    gravgravidityobstetric
    parparityobstetric
    petpreeclampsiaobstetric
    prempretermobstetric
    ptbpreterm birthobstetric
    thrmcthreatened miscarriageobstetric
    toptermination of pregnancyobstetric
    infertinfertilityobstetric
    gahtngestational hypertension  obstetric
    hellpHELLP syndromeobstetric
    rom18hruptured membranes >18 hoursobstetric
    mgs04magnesium sulphateobstetric
    acsantenatal corticosteroidsobstetric
    acsrptrepeat antenatal corticosteroidsobstetric
    labrlabourobstetric
    birthmodemode of birthobstetric
    gagestational age at birthobstetric
    pmaweeks post LMPobstetric