Genetic and environmental contributions to childhood obsessive behavior: A cross-cultural twin study.

Context: We have reported elsewhere on the development of an 8-item Obsessive-Compulsive Scale (OCS) contained in the Child Behavior Checklist (CBCL) to identify children who meet criteria for DSM-IV obsessive-compulsive disorder. Twin studies of obsessive-compulsive disorder have indicated a significant genetic component to its expression. Objective: To determine the relative contributions of genetic and environmental influences on childhood obsessive-compulsive behavior using the CBCL OCS in twin samples. Design: The CBCL data were received by survey of twins in the Netherlands Twin Registry... Mehr ...