Article
A study of genetic and environmental effects on the co-occurrence of problem behaviors in three-year-old twins.
Journal of abnormal psychology - 1 Aug 2000
Van den Oord Edwin J C G, Boomsma Dorret I, Verhulst Frank C
Abstract excerpt
The authors examined the genetic and environmental causes of the co-occurrence of problem behaviors in children. The analyses involved mother and father ratings of Oppositional, Withdrawn/Depressed, Aggressive, Anxious, Overactive, and Sleep Problems in 446 monozygotic and 912 dizygotic pairs of 3-year-old twins. Genetic factors contributed on average .150 (37.3%), shared environment .206 (51.2%), and nonshared...
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