A 45-day timeline follow-back (TLFB) interview [26] was administered to assess current drinking behavior in young adults, providing estimates of the distribution of drinking days and the amount of daily alcohol consumption. To assist recall, participants were asked to bring their time planner to the interview. Aided by the diary, the interviewer then inquired about the number of drinks on each day, beginning with the current day and working backward. In the literature, there is ample evidence of the reliability and validity of the TLFB method [27]. The number of drinking days and the total number of drinks were derived. Individuals with 6 or more drinking days in the last 45 days (i.e. with approximately a weekly intake) were assigned to the regular alcohol user group.
