Genetic and Environmental Influences on Pubertal Timing: Results From Two National Sibling Studies

Authors


  • Xiaojia Ge and Misaki N. Natsuaki are now at the University of Minnesota, Twin Cities. Jenae M. Neiderhiser is at the Pennsylvania State University. David Reiss is now at Yale University.

Requests for reprints should be sent to Xiaojia Ge, Institute of Child Development, University of Minnesota, Twin Cities, 51 East River Parkway, Minneapolis, MN 55455. E-mail: gexj@umn.edu

Abstract

This study examined genetic and environmental effects on individual variation in pubertal timing using two national samples of siblings from the Nonshared Environment of Adolescent Development (NEAD) and the National Longitudinal Study of Adolescent Health (Add Health). In each sample, female and male siblings with different degrees of genetic relatedness, i.e., monozygotic twins, dizygotic twins, full siblings, half siblings, and unrelated siblings in blended families, were assessed. Timing of pubertal development was measured by age-adjusted self-report measures of the Pubertal Development Scale in NEAD and a four-item scale of pubertal development in the Add Health. The results indicated that both genetic and environmental influences play an important role in determining the relative timing of pubertal development for both boys and girls.

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