In order to reduce participant burden and increase compliance with the EMA protocol assessments proceeded as follows: (1) urge to drink was assessed at the Begin Drink Report and again at the End Drink Report for the first and second drinks; (2) all mood items were assessed at the Begin Drink Report and then at the End Drink Report for the second drink only. At the End Drink Report for the first drink, participants reported on contextual and environmental factors surrounding the drink episode, with questions such as (a) “Where were you?” (i.e., Setting) with possible answers being: home, work, school, other’s home, bar, restaurant, liquor store, vehicle, outside, or other; (b) “Were others drinking?” with possible answers being ‘yes’, ‘no’, or ‘others in view’; and (c) “How long before the drink was your last cigarette?” with possible answers ranging from 0 to 99 minutes. These episode-varying contextual and environmental factors were examined in the analyses as time-varying covariates. As described below, BAC was estimated for each drink and used in all analyses.
