The efficacy of alcohol reduction applications is variable, and the underlying factors are largely unknown. The aim of this study is threefold: evaluate the relationship between user engagement and intervention efficacy, investigate the efficacy of the different functions applied, and investigate the efficacy of the intervention application compared to control groups.

中文翻译：

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复杂智能手机应用程序减少有害酒精消费的功效：随机对照试验的研究协议，分析与结果相关的应用程序内用户行为。

酒精减少应用的功效是可变的，潜在的因素在很大程度上是未知的。本研究的目的有三个：评估用户参与度和干预效果之间的关系，调查应用不同功能的效果，以及调查干预应用与对照组相比的效果。