Impact of Repeated Exposure to Alcohol Health Warning Messages in a Real-world Online Retail Setting: Protocol For a Randomised Controlled Trial in Systembolaget App
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 11,719
- 试验地点
- 2
- 主要终点
- Number of purchased units of alcohol
研究概览
简要总结
The goal of this between-participants parallel randomized controlled trial conducted in the Systembolaget mobile application is to investigate the impact of exposure to health messages on cognition and behaviour.
The primary study objective is to examine whether repeated exposure to rotating health warning messages in a mobile app where customers can purchase alcoholic beverages influences the number of purchased units of alcohol over the studied period.
The secondary objectives are to examine whether repeated exposure to health warning messages in a mobile app influences the number of alcoholic and non-alcoholic products purchased over the studied period, knowledge of alcohol-related harms, alcohol-related risk perceptions, emotional response to the message, engagement with the messages, behavioural intentions and self-reported behaviour of the study participants.
Users of the app providing informed consent for participation in the study will be assigned either to an experimental group, where they will be exposed to rotating messages describing health risks associated with alcohol designed in line with the existing Swedish regulation, or to a control group that will be exposed to messages reflecting existing industry practice.
The intervention will last for ten weeks, during which the recruited participants' data on product purchases in the app will be collected through in-app analytics. Both the number of alcoholic units and number of products purchased per session will be assessed and compared at the session level between the two groups. At the end of the intervention, participants will complete a short survey examining their knowledge, risk perceptions, emotional response, engagement with the messages, intentions and behaviour.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- None
入排标准
- 年龄范围
- 20 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •minimum alcohol purchase age in Sweden (20+)
- •have downloaded the Systembolaget app and have given permission to the app to track in-app analytics
- •understand Swedish language
排除标准
- •not of minimum alcohol purchase age in Sweden
- •no permission to track in-app analytics
- •no understanding of Swedish language
研究组 & 干预措施
Intervention
Participants in the intervention group will be exposed to textual health warning messages currently mandated for use in printed alcohol advertisements under the Swedish Alcohol Ordinance (1994:2046). Messages will rotate, with each user exposed to a single message per session. The following eight messages will be included:
Alcohol is addictive. Alcohol can cause damage to nerves and the brain. Alcohol can cause damage to the liver and pancreas. Alcohol can cause cerebral haemorrhage and cancer. Half of drivers who die in road traffic accidents involving just one vehicle are under the influence of alcohol.
Half of all people who drown have alcohol in their blood. Alcohol consumption during pregnancy can damage the child. Children who are given alcohol at home drink to intoxication more frequently than other children.
干预措施: Health messages - existing Swedish legislation (Behavioral)
Control
The control group will consistently be exposed to health messages that are commonly present on existing alcohol labels and are aligned with voluntary commitments of alcohol producers, such as pictograms indicating no alcohol use during pregnancy and while driving. These pictograms will be displayed in black and white and in small sizes consistent with current practice, with a diameter of approximately 6 millimetres.
干预措施: Health messages - pictograms (Behavioral)
结局指标
主要结局
Number of purchased units of alcohol
时间窗: From enrolment to the end of the intervention period at 10 weeks
Alcohol units will be calculated based on product-specific information on alcohol by volume (ABV) and volume purchased. The calculations will be made for the overall purchases and separately by type of beverage (beer, wine, spirits, other).
次要结局
- Number of individual purchased products(From enrolment to the end of the intervention period at 10 weeks.)
- Knowledge of alcohol-related harms(End of 10 week intervention period)
- Self-reported behaviour(End of 10 week intervention period)
- Risk perception(End of 10 week intervention period)
- Intention(End of 10 week intervention period)
- Emotional response(End of 10 week intervention period)
- Engagement with messages(End of 10 week intervention period)
研究者
Daša Kokole
Principal Investigator
World Health Organization