13–15, with no differences from age 16 onwards. In Model III, controlling for family background and offspring characteristics, Group 1 offspring were at a 29% increased hazard of alcohol use, with differences among Groups 1–3 non-significant. In addition, parental separation was associated with a 3.24 times higher hazard of alcohol use through age 12, with a 20% higher hazard from age 13 onwards. Interactions between father DD/AD and parental separation were tested by adding an interaction term to Models II and III; no interaction terms were significant (p > 0.05).
