Main findings School-based programmes Of the 53 trials, 41 were conducted in North America. Relative to a standard curriculum, six of the 11 trials of alcohol-specific interventions found some statistically significant reductions in drinking. Another 39 studies tested more generic programmes. Of these, 14 found some statistically significant reductions in drink-related outcomes relative to a standard curriculum. Some apparently positive results may have been due to inadequate adjustment for ‘clustering’ effects (eg, of children in a class and of classes in schools), and in some studies results were confined to certain subgroups and/or some measures of drinking but not others. Most commonly, significant effects related to drunkenness and binge drinking. Impacts tended to last longer after generic than after alcohol-specific or other programmes. Overall, the evidence is more convincing for certain generic rather than alcohol-specific programmes. Among generic programmes, those based on psychosocial or developmental approaches (life skills in Life Skills Training; social skills and norms in Unplugged; behaviour norms and peer affiliation in the Good Behaviour Game) were most likely to report statistically significant effects over several years when compared to standard school curricula or other types of interventions.
Family-based programmes All but one of the 12 trials were conducted in North America. Nine recorded statistically significant reductions in drinking, in some cases over longer as well as shorter term follow-ups. One study recorded apparently negative effects which may have arisen by chance or due to methodological issues. In another, though ineffective on its own, the family-based intervention was effective when combined with a school-based intervention. There is some evidence for the short to medium-term success of gender-specific interventions for daughters, typically involving their mothers. Some trials found impacts only among children already using substances at the start of the trial.
Multi-component programmes All but three of the 20 trials were conducted in the USA. Relative to comparison conditions, 12 trials reported statistically significant reductions in drinking lasting up to three years among children allocated to multi-component programmes. Six of the 20 trials found no statistically significant differences, and in another significant reductions were confined to children already drinking at the start of the trial. It was unclear whether in general adding further prevention components to an existing programme improved outcomes; reports on four trials indicated some possible benefits, but another three trials found no such indications. Read More>>