Alcohol use history was assessed using the timeline follow-back methodology of the Lifetime Drinking History questionnaire (Skinner and Allen, 1982; Sobell and Sobell, 1990). This provided alcohol use variables for lifetime use and the duration of abstinence. The density of a family history of alcohol problems was assessed using the family history drinking questionnaire (Mann et al., 2005). The family history density (FHD) measure was the proportion of first-degree relatives who had alcohol problems.
