We investigated longitudinal associations between adolescent attention-deficit/hyperactivity disorder (ADHD) symptoms and later antisocial behavior and tested 1) whether these associations are independent of familial factors shared by co-twins and 2) whether cognitive performance moderates the associations. In a population-based sample of Finnish twins (N = 602-1330, 53% female), we assessed ADHD symptoms with teacher assessments and a diagnostic interview in adolescence, symptoms of antisocial…
