We then tested for differential association of the 3 familial factors with education and age at diagnostic interview. For education, robust negative and positive coefficients, respectively, were evident for the genetic rule-breaking factor and the shared environmental (covert delinquency) factor. By contrast, the genetic overt aggression factor was not associated with educational level. A quite different pattern was found for age. Rule breaking did not emerge as a significant predictor, but both overt aggression and covert delinquency exhibited a relatively strong inverse association with age.
