IBG Wiki

Created 01-Jul-2020

Last updated 23-Jul-2020

The health measures were collected using different instruments at the various sites. Only height and weight data available from Scandinavia. Query whether other information is available

There are four main components:

1. Information about the birth status of the twin (prematurity & birth complications):
   • In AUS: from tblParentInfo.xlsx, last updated 03-Apr-2015
   • In CO: from prekinfo.xlsx, last updated 25-Apr-2013
   • In SCAN: from SWE_addata 20120903.sav (does not have birth complications).
2. Information about the cumulative health status of the twins prior to IT testing (medical problems, medications, speech problems, and handedness
   • In AUS: from tblParentInfo.xlsx
   • In CO: from prekinfo.xlsx (Handedness collected by testers at post-K visit)
   • In SCAN: No information located.
3. Information about past year accidents, illnesses, and other health problems at each wave (see initial CO form) IT form
   • In CO: from health forms for each age (maternal report)
   • In AUS: IT not collected separately from cumulative, F1-F3 from HealthF1,HealthF2, & HealthF3.sav files. See intake form here: AUS Intake
   • In SCAN: No information located
4. Information about height and weight (IT-F4), plus birth weight and Apgar scores, plus zygosity (& source)
   • In AUS: birth weight from tblParentInfo.xlsx, Missing IT-F3
   • In CO: birth weight and Apgar from birth cert, and from parent CTR form (May have mix-up in CTR twins); IT-F4 from tester reports
   • In SCAN: birth weight, birth length, and IT-F4 from SWE_addata 20120903.sav

In addition, some information about problems apparent during testing were collated from tester reports, with the idea that they might be useful for explaining within-family (particularly MZ) differences Here is a copy of meeting notes in Australia in 2007 where the idea was discussed: Discordancies

These data were entered in CO as healthcodes02-08, and included categories for Allergies, Emotional or Behavioral, Medical or Physical, Family issues, Prenatal or Birth Conditions, and School Issues. The specific codes for each category are listed in this Word document: Health codes

Although equivalent coded data has not been located for Australia, the tester ratings entered by Rosemary include tester notes which serve a similar purpose. I believe we can compile notes into a text-based summary file of issues that may suggest reasons twins are discrepant.

Open Questions

1. Did earlier data files from Stefan contain any health information?
   • Apparently Not: Can only locate Literacy, Behavior, and Questionnaire files
2. Did the AUS updates of parent data in the Parent Tables (May, 2015) contain additional health information?
   • Apparently Not: ID comparisons show 1 more subject in HealthF1.sav, same subjects in HealthF3.sav
3. Are there any other data that should be incorporated into the health file?
   • Examine contents of Robyn Mansfield summary file

1. From AUS: Height and Weight measures for F1-F3
2. From AUS: Past year data on accidents, illnesses, allergies at IT (wrapped into cumulative problems?)
3. From AUS: Coded set of individual child issues explaining discrepant twin performance
4. From CO: Complete set of individual child codes for later-tested children.
5. From SCAN: Birth complications
6. From SCAN: Information on cumulative health issues at time of IT
7. From SCAN: Past year data of accidents, illnesses, allergies IT-F4
8. From SCAN: Codes for individual children to explain discrepant twin performance