depicts demographic data for the participants in the externalizing risk groups. In general, the data in Table 1 indicate that compared with the low-risk fathers, both the intermediate- and severe-risk fathers were less well educated and had lower levels of occupational status. Ethnicity did not differ significantly across risk groups. Regarding offspring diagnoses, prevalence rates were substantially higher in the severe- versus the low-risk group. As expected, those in the intermediate-risk group generally tended to fall between these other two groups. Offspring IQ did not differentiate the groups. Data were available for the first visit and two subsequent follow-ups at roughly 3-year intervals. Informed consent was obtained from all adult participants. Informed assent and parental consent were obtained when participants were under 18 years. All procedures were approved by the appropriate institutional ethics review board.
