Determining zygosity in the Vietnam Era Twin Registry: an approach using questionnaires.

Abstract:

:The Vietnam Era Twin Registry (VETR) is a registry of 7375 American male veteran twin pairs born between 1939 and 1955 who served in the armed forces of the United States between 1964 and 1975. Optimal use of registry data requires the determination of zygosity. Two approaches are available: analysis of blood genetic marker systems and responses of twins to questions about sibling similarity. Zygosity for the VETR was determined using the questionnaire technique supplemented with blood group typing data abstracted from military records. After comparing four alternative zygosity assignment methods, a logistic regression technique which uses discriminating variables based on race was selected. The approach is similar to that described by Magnus et al. (1983) in their study of Norwegian twins, suggesting that questionnaire responses are independent of nationality and reinforcing the reliability of the questionnaire method for zygosity ascertainment.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Eisen S,Neuman R,Goldberg J,Rice J,True W

doi

10.1111/j.1399-0004.1989.tb02967.x

subject

Has Abstract

pub_date

1989-06-01 00:00:00

pages

423-32

issue

6

eissn

0009-9163

issn

1399-0004

journal_volume

35

pub_type

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