Age at first sexual intercourse and teenage pregnancy in Australian female twins

Mary Waldron, Andrew C. Heath, Eric Turkheimer, Robert Emery, Kathleen K. Bucholz, Pamela A.F. Madden, Nicholas G. Martin

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Girls who report first sexual intercourse during their early teen years have much higher rates of teenage pregnancy and childbearing than girls who delay sexual onset until older adolescence. In this study, we examine genetic and environmental influences on variation in teenage pregnancy and covariation with age at first sexual intercourse in two cohorts of Australian female twins. In the older twin cohort, born 1893-1964, we observe substantial heritable variation in teenage pregnancy that is largely shared with heritable variation in age at first sexual intercourse, with shared environment contributintablg little to variation in teenage pregnancy. Genetic influences on teenage pregnancy are smaller and nonsignificant in the younger twin cohort, born 1964-1971, where shared environment contributes much more and overlaps entirely with shared environmental variation in age at first intercourse.

Original languageEnglish
Pages (from-to)440-449
Number of pages10
JournalTwin Research and Human Genetics
Volume10
Issue number3
DOIs
StatePublished - Jun 2007

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