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Genetic influence on age at first birth of female twins born in the UK, 1919-68

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  • Felix C. Tropf
  • Nicola Barban
  • Melinda C. Mills
  • Harold Snieder
  • Jornt J. Mandemakers

Abstract

Using a sample of monozygotic (945, 42 per cent) and dizygotic (1,329, 58 per cent) twin pairs born 1919�68 in the UK, we applied innovative tobit models to investigate genetic and environmental influences on age at first birth (AFB). We found that a substantial part (40 per cent) of the variation in AFB is caused by latent family characteristics. Genetic dispositions (26 per cent) play a more important role than the shared environment of siblings (14 per cent), with the non-shared environment/measurement error having the strongest influence (60 per cent). Like previous studies, this study reveals marked changes in estimates over time, and supports the idea that environmental constraints (war or economic crisis) suppress and normative freedom (sexual revolution) promotes the activation of genetic predispositions that affect fertility. We show that the exclusion of censored information (i.e., on the childless) by previous studies biased their results. Supplementary material for this article is available at: http://dx.doi.org/10.1080/00324728.2015.1056823

Suggested Citation

  • Felix C. Tropf & Nicola Barban & Melinda C. Mills & Harold Snieder & Jornt J. Mandemakers, 2015. "Genetic influence on age at first birth of female twins born in the UK, 1919-68," Population Studies, Taylor & Francis Journals, vol. 69(2), pages 129-145, July.
  • Handle: RePEc:taf:rpstxx:v:69:y:2015:i:2:p:129-145
    DOI: 10.1080/00324728.2015.1019955
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    References listed on IDEAS

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    1. Griffith Feeney & John Bongaarts, 2006. "The Quantum and Tempo of Life-Cycle Events," Vienna Yearbook of Population Research, Vienna Institute of Demography (VID) of the Austrian Academy of Sciences in Vienna, vol. 4(1), pages 115-151.
    2. Easterlin, Richard A., 1987. "Birth and Fortune," University of Chicago Press Economics Books, University of Chicago Press, edition 2, number 9780226180328, September.
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    1. Felix C. Tropf & Jornt J. Mandemakers, 2017. "Is the Association Between Education and Fertility Postponement Causal? The Role of Family Background Factors," Demography, Springer;Population Association of America (PAA), vol. 54(1), pages 71-91, February.
    2. Nicola Barban & Elisabetta De Cao & Marco Francesconi, 2021. "Gene-Environment Effects on Female Fertility," CESifo Working Paper Series 9337, CESifo.
    3. Tropf, Felix C & Mandemakers, Jornt J, 2017. "Is the Association Between Education and Fertility Postponement Causal? The Role of Family Background Factors," OSF Preprints dqrrx, Center for Open Science.
    4. Fletcher, Jason M. & Polos, Jessica, 2017. "Nonmarital and Teen Fertility," IZA Discussion Papers 10833, Institute of Labor Economics (IZA).

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