Factor scores for the 3 familial factors—2 genetic and 1 common environmental—were computed for each twin. As depicted in Table 3, we then examined the association between these factor scores and the domains of personality, psychiatric disorders, and demographics. In the domain of personality, both the rule-breaking (A1) and overt aggression (A2) factors were significantly and positively related to neuroticism, whereas the covert delinquency factor (C1) was not. Rule breaking was positively related to extraversion whereas covert delinquency showed a negative association, with overt aggression unrelated to extraversion. All 3 familial factors were significantly and positively associated with novelty seeking, although prediction was stronger for the rule-breaking factor than for overt aggression or covert delinquency.
