NDLI: Ascertainment of a Twin Sample by Computerized Record Matching, with Assessment of Possible Sampling Biases

Content Provider	Springer Nature Link
Author	Heath, Andrew C. Madden, Pamela A. F. Bucholz, Kathleen K.
Copyright Year	1999
Abstract	We review progress made in ascertaining a twin sample by computerized record matching. A target sample of 1856 female like-sex twin pairs born 1975–1983, and believed to be both still living, was identified from state birth records. In 30 months, during 1995–1997, contact with 86% of families was established, although the success rate was lower for minority (principally African-American) families (74%). An estimated 15% of school-aged twin pairs were discordant either for school grade level or for school attendance and would have been missed in any school-based ascertainment scheme. Equal proportions of majority and minority families were living in state at the time they were traced (85.6 versus 85.3%). Using a conservative adjustment for the reduced probability of finding out-of-state (“mobile”) families, we project that 80% of families were still living in the state where the twins were born. Mobile families on average had better-educated parents, had higher incomes, and were more likely to remain two-parent families but did not differ in rates of parental psychopathology (alcoholism or depression). Hard-to-find families—those in which time to completion of a first-contact interview was greater than the 90th percentile—were more likely to be African-American, to have an alcoholic biologic father, to be living out of state, and to be larger and poorer. Adjusting for undersampling of out-of-state residents had little impact on conclusions about genetic and environmental contributions to offspring risk of behavioral problems, as assessed by parental ratings of the twins' oppositional symptoms and school grades.
Starting Page	209
Ending Page	219
Page Count	11
File Format	PDF
ISSN	00018244
Journal	Behavior Genetics
Volume Number	29
Issue Number	4
e-ISSN	15733297
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1999-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Human Genetics Neurosciences Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Ecology, Evolution, Behavior and Systematics Genetics (clinical)

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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