A Component Evaluation of a Randomised Control Community Intervention to Reduce Adolescent Alcohol Use in Australia.

Despite a decline in Australian adolescents reporting to have consumed alcohol, a high proportion of the adolescent population still consumes alcohol. Community-led prevention interventions that systematically and strategically implement evidence-based programs have been shown to be effective in producing population-behaviour change related to youth alcohol and drug use. 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. Structural equation modelling was used to examine direct and indirect effects of community intervention components on intention and consumption. Self-report surveys (N = 3377) 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. 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). Total indirect effects from the intervention through to intention were significant. However, parents setting a rule and not supplying alcohol were the only significant direct effects to intention. Parents setting a rule was directly associated with lower consumption. Overall, the intervention logic was supported by the data modelling. The study extends prior knowledge of community-based interventions to prevent adolescent alcohol use by identifying critical intervention components and effect mechanisms. ClinicalTrials.gov Identifier: ACTRN12612000384853.

Social marketing and community mobilisation to reduce underage alcohol consumption in Australia: A cluster randomised community trial.

BACKGROUND AND AIMS: In many countries adolescent alcohol use is a major health problem. To supplement national policies, it is important to trial community interventions as a potential strategy to prevent adolescent alcohol use. METHODS: This study evaluated a multicomponent community intervention that included community mobilisation, social marketing, and the monitoring of alcohol sales to minors. Evaluation was a clustered randomised trial design with 14 intervention and 14 control communities. Prior to randomisation, communities were matched on socioeconomic status and location. Intervention communities were not blinded. PARTICIPANTS: 3545 Year 8 students (M = 12 years) were surveyed at baseline from 75 schools; 3377 students were surveyed post intervention in 2013 from 54 schools. OUTCOMES: It was hypothesised that the primary outcome, individual alcohol consumption in last 30 days, after the intervention would be 15% lower in intervention communities. Secondary outcomes were consumption in the past year and intention not to drink before age 18. RESULTS: The intervention communities showed larger relative reductions compared to the controls in last 30-day consumption and past year (10%), but not significantly different. A significantly lower proportion of participants in the intervention community (63%), compared to the controls (71%), reported intending to drink before 18 years old. Subgroup analysis identified regional and state differences for some secondary measures. CONCLUSIONS: Intervention assignment was associated with lower adolescent intention to drink before the age of 18. However, more intensive and longer-term intervention may be required to measure significant differences in behaviour change. TRIAL REGISTRATION: ACTRN12612000384853. PROTOCOL: Rowland B, Toumbourou JW, Osborn A, et al. BMJ Open 2013;3:e002423. doi:10.1136/bmjopen-2012-002423.