Participants reported whether they believed their biological mother or father ever had a drinking problem (Yes or No). For our analyses, we created a composite parental history of alcohol problems measure indexing whether either parent had an alcohol problem. Participants who indicated that neither parent had an alcohol problem were assigned a score of 0 and those who indicated that either parent had an alcohol problem were assigned a score of 1. Further details regarding the development and predictive validity of these brief family history screening items can be found in Kendler et al. (2015a).
