9/12/2023 0 Comments Colorado adoption project findingsJ Adolesc Health 36:428–436īlinn-Pike L (1999) Why abstinent adolescents report they have not had sex: understanding sexually resilient youth. Am J Sociol 106:859–912īersamin MM, Walker S, Waiters ED, Fisher DA, Grube JW (2005) Promising to wait: virginity pledges and adolescent sexual behavior. J Youth Adolesc 33(4):353–363īearman PS, Bruckner H (2001) Promising the future: virginity pledges and first intercourse. Public Opin Quart 45:536–548īabalola S (2004) Perceived peer behavior and the timing of sexual debut in Rwanda: a survival analysis of youth data. 3īachman JG, O’Malley PM (1981) When four months equal a year. The Allen Guttmacher Institute (2001) Can more progress be made? Teenage sexual and reproductive behavior in developed countries. National Center for Health Statistics, Hyattesville, MD Evidence for genetic influences from our data were somewhat lower than those obtained in previous twin studies, possibly reflecting a return to more socially conservative sexual attitudes, changing sexual behaviors, or ambiguities in the wording of questions commonly used in research on adolescent sexuality.Ībma JC, Sonenstein FL (2001) Sexual activity and contraceptive practices among teenagers in the United States, 19. However, because adoptive siblings provide a direct estimate of shared environmental influences there is greater power to detect shared environmental effects in adoption designs. Despite the lower point estimate for shared environmental effects than additive genetic effects, a CE model provided the best fit to the data. Point estimates of variance components from an ACE model, including additive genetic (A), shared environmental (C), and non-shared environmental (E) influences were 28%, 24%, and 48%, respectively. (Behav Genet 24(5):457–468, 1994) to accommodate adoptive and non-adoptive siblings. Information from censored individuals who had not yet experienced sexual initiation was maximized by adapting the twin survival analysis method of Pickles et al. Structural equation models were fitted to data from adoptive and non-adoptive sibling pairs (231 biologically related pairs and 169 unrelated pairs) from the Colorado Adoption Project. Whereas the majority of research on adolescent sexual initiation has focused solely on environmental factors, the present study used behavioral genetic analyses to investigate the relative contributions of genetic and environmental influences.
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