Common genetic and nonshared environmental factors contribute to the association between socioemotional dispositions and the externalizing factor in children.

Abstract excerpt

BACKGROUND: Childhood behavioral disorders including conduct disorder (CD), oppositional defiant disorder (ODD), and attention-deficit/hyperactivity disorder (ADHD) often co-occur. Prior twin research shows that common sets of genetic and environmental factors are associated with these various disorders and they form a latent factor called Externalizing. The developmental propensity model posits that CD develops...

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