Archives of Sexual Behavior

, Volume 35, Issue 6, pp 647–658

Genetic and Environmental Influences on Cross-Gender Behavior and Relation to Behavior Problems: A Study of Dutch Twins at Ages 7 and 10 Years

  • C. E. M. van Beijsterveldt
  • James J. Hudziak
  • Dorret I. Boomsma
Article

DOI: 10.1007/s10508-006-9072-0

Cite this article as:
van Beijsterveldt, C.E.M., Hudziak, J.J. & Boomsma, D.I. Arch Sex Behav (2006) 35: 647. doi:10.1007/s10508-006-9072-0

Abstract

The aim of this study was to investigate the prevalence of cross-gender behavior during childhood, to estimate the influence of genotype and environment on variation in cross-gender behavior, and to explore the association of cross-gender behavior with maternal ratings of behavior problems as indexed by the Internalizing and Externalizing scales of the Child Behavior Checklist (CBCL). Cross-gender behavior was assessed by two items from the CBCL: “behaves like opposite sex” and “wishes to be of opposite sex.” As part of an ongoing longitudinal study of the Netherlands Twin Registry, mothers were asked to complete the CBCL for their twins when they were 7 (n∼14,000 twins) and 10 years old (n∼8,500 twins). The prevalence of cross-gender behavior (as measured by maternal report of behaving like or wishing to be the opposite sex) was 3.2% and 5.2% for 7-year-old boys and girls, respectively, and decreased to 2.4% and 3.3% for 10-year-old boys and girls. Surprisingly, the prevalence rate of cross-gender behavior of girls with a male co-twin was lower than of girls with a female co-twin. At both ages, the similarity for cross-gender behavior was greater in monozygotic than in dizygotic twins pairs. Genetic structural equation modeling showed that 70% of the variance in the liability of cross-gender behavior could be explained by genetic factors, at both ages and for both sexes. Cross-gender behavior was associated with higher scores on Internalizing and Externalizing problems, both in boys and in girls.

Keywords

Cross-gender Behavior Heritability Twins Child Behavior Checklist Gender identity disorder 

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • C. E. M. van Beijsterveldt
    • 1
  • James J. Hudziak
    • 2
  • Dorret I. Boomsma
    • 1
  1. 1.Department of Biological PsychologyVrije UniversiteitAmsterdamThe Netherlands
  2. 2.Department of Psychiatry and Medicine (Division of Human Genetics) and Centre for Children, Youth, and FamiliesUniversity of Vermont College of MedicineBurlingtonUSA

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