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Conduct disorder during adolescence is associated with long-term social and functional impairment, although most evidence comes from high-risk adolescents with severe externalizing behavior (hyperactivity, aggression). In a population-based study, investigators in the U.K. examined adult outcomes of 3652 adolescents who were enrolled in a birth-cohort study in 1946 and followed until age 53.
Based on teacher assessments at age 13 and 15 years, 9.5% of adolescents had severe externalizing behavior, 29.0% had mild externalizing behavior, and 62.0% did not have externalizing behavior. Adolescents with externalizing behavior were more likely as adults to report negative outcomes (e.g., symptoms of depression and anxiety, marital problems, financ…