A component evaluation of a randomised control community intervention to reduce adolescent alcohol use in Australia

Background: This study evaluated the post-intervention effects of a multi-component community intervention in Australia. It comprised social marketing targeting adolescents and parents, and a community intervention to reduce underage alcohol sales. Method: Self-report surveys (N = 3,377) and community sales data (27 communities) were analysed to evaluate the effect of the intervention components on intention and consumption before the age of 18. Results: The intervention reduced alcohol sales to minors (OR=.82). Exposure to the social marketing was significantly associated with household no-alcohol rules (OR=2.24) and parents not supplying alcohol (OR=.72). The intervention predicted intention not to consume alcohol before age 18; intention was associated with not consuming alcohol (OR=5.70). Conclusion: The intervention logic was supported by the data modelling.