Design: Two-arm individually randomised controlled trial.
Setting: Online trial in the UK.
Participants: Hazardous or harmful drinkers (Alcohol Use Disorders Identification Test [AUDIT] score >=8) aged 18+, and want to drink less alcohol (n=5,562). Participants will be recruited from July 2020 to May 2022 using multiple strategies with a focus on remote digital methods.
Intervention and comparator: Participants will be randomised to receive either an email recommending that they use Drink Less (intervention) or view the NHS webpage on alcohol advice (comparator).
Measurements: The primary outcome is change in self-reported weekly alcohol consumption, assessed using the extended AUDIT-Consumption, between baseline and 6-month follow-up. Secondary outcomes include change in self-reported weekly alcohol consumption assessed at 1 and 3-month follow-ups, and the proportion of hazardous drinkers; alcohol-related problems and injury; health-related quality of life, and use of health services assessed at 6-month follow-up. Effectiveness will be examined with adjusted regression models, adjusting for baseline alcohol consumption, and using an intention-to-treat approach. A mixed-methods process evaluation will assess engagement, acceptability and mechanism of action. Economic evaluations will be conducted using both a short- and longer-term time horizon.
Comments: This study will establish the effectiveness and cost-effectiveness of the Drink Less app at reducing alcohol consumption among hazardous and harmful adult drinkers and will be the first RCT of an alcohol reduction app for the general population in the UK. This study will inform the decision on whether it is worth investing resources in large-scale implementation.
|Publication status||Accepted/In press - 5 Oct 2020|
- Physical and Mental Health
- Tobacco and Alcohol
- alcohol reduction
- smartphone app
- behaviour change