In both samples, child mental health outcomes were characterized by parent-report, in MOTWIN using the Child Behavior Checklist [26] (which generates a quantitative severity score for current externalizing behavior that is highly predictive of DSM-IV Conduct Disorder Diagnosis), and in COGA using the child and adolescent versions of the Semi-Structured Assessment for the Genetics of Alcoholism. [27] The validity of parent-report methods for ascertaining enduring aspects of child and adolescent antisocial behavior is well-established. [28] Outcomes were dichotomized for the confidentiality reasons cited above.
