Developmental subtypes of antisocial conduct problems were identified in previous work using general growth mixture modeling and 1,020 of the original 1,037 study members were assigned to a conduct-problem trajectory group (Odgers et al., 2007, 2008). Conduct problems were assessed prospectively at ages 7, 9, 11, 13, 15, 18, 21, and 26 via mother and teacher report in childhood, self-reports of conduct problems in adolescence, and by informant and self-reports in young adulthood. Six key symptoms of conduct disorder were scored as being present or absent at each age: physical fighting, bullying others, destroying property, telling lies, truancy, and stealing. Study members were classified into life-course persistent (LCP; 9.0%), adolescent-onset (18.6%), childhood-limited (22.1%), and low (50.3%) trajectories of conduct problems (see Figure 1).
