On the first day of study initiation in both studies, participants completed an orientation to the DD assessments. For participants in Study 1, 50 participants (58.8%) completed their daily diaries via a telephone interactive voice response system. The remaining 35 participants (41.2%) completed their assessments via a smartphone app (MetricWire, Inc) because of a change in the protocol. Participant responses in Study 2 were collected entirely through the app. Measurements were collected during an evening survey that was triggered at 8 pm every night that participants could complete within six hours before going to bed. For Study 2, participants also completed a morning survey at 8 am where participants reported their alcohol use for the previous day, which was used to estimate drinking if the participants missed the previous day’s evening survey. Compliance was monitored throughout the study. Participants were paid $2 per day for responding to surveys and received an additional $10 bonus for completing all surveys that week.
