Alcohol use behaviors employed in our analyses were the frequency of drinking any alcohol and the frequency of drinking to intoxication. This information was based on questionnaire items at each study wave. The item on intoxication was not included in the age 12 questionnaire. At age 12, the dichotomous drinking variable asked “Have you ever drunk alcohol without adults around”. “No” responses were coded as 0 and “Yes” responses as 1. At ages 14 and 17, the frequency variables for any drinking and drinking to intoxication had the following four ordered categories: (0) I do not use alcohol, (1) Less than once a month, (2) Approximately once or twice a month, and (3) Once a week or more often. In young adulthood, the variable for drinking to intoxication had these same four categories, while the categorization of the frequency of any drinking was: (0) Less than once a month or never, (1) Approximately once or twice a month, (2) Once a week, and (3) A couple of times a week or more often. These variables have been used in earlier
