Demography

, Volume 38, Issue 1, pp 29–42

Behavior genetic modeling of human fertility: findings from a contemporary danish twin study

  • Joseph Lee Rodgers
  • Hans-Peter Kohler
  • Kirsten Ohm Kyvik
  • Kaare Christensen
Fertility models and processes

Abstract

Behavior genetic designs and analyses can be used to address issues of central importance to demography. We use this methodology to document genetic influence on human fertility. Our data come from Danish twin pairs born from 1953 to 1959, measured on age at first attempt to get pregnant (FirstTry) and number of children (NumCh). Behavior genetic models were fitted using structural equation modeling and DF analysis. A consistent medium-level additive genetic influence was found for NumCh, equal across genders; a stronger genetic influence was identified for FirstTry, greater for females than for males. A bivariate analysis indicated significant shared genetic variance between NumCh and FirstTry.

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Copyright information

© Population Association of America 2001

Authors and Affiliations

  • Joseph Lee Rodgers
    • 1
  • Hans-Peter Kohler
    • 2
  • Kirsten Ohm Kyvik
    • 3
    • 4
  • Kaare Christensen
    • 3
    • 4
  1. 1.Department of PsychologyUniversity of OklahomaNorman
  2. 2.Max Planck Institute for Demographic ResearchGermany
  3. 3.Section for EpidemiologyInstitute for Public HealthGermany
  4. 4.The Danish Twin RegistryUniversity of Southern DenmarkDenmark

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