Timeline-Followback (TLFB): A Timeline Followback (TLFB) was completed by each subject during screening and interview. The TLFB offers a daily retrospective report of alcohol consumption over a specific time interval, from which quantity, drinks per drinking occasion, and pattern of drinking can be obtained (Sobell and Sobell, 1992; Sobell and Sobell, 2003). Participants completed a log based on a monthly calendar to indicate daily alcohol drinking to provide the total number of alcoholic drinks consumed in the last 28 days prior to SRE administration (quantity). This quantity was then divided by the total number of drinking days, also within the last 28 days, to calculate Drinks per drinking day. Studies have shown that this is an adequate period of assessment and TLFB is established as an effective measure of drinking patterns among normal drinkers in short time intervals (Sobell et al., 1988; Ramchandani et al., 2002; Collins et al., 2008). TLFB demonstrates a test-retest reliability correlation ranging from 0.86 to 0.90 for normal drinkers within the last 30 drinking days (Sobell et al., 1988).
