This paper presents findings from an overview of meta-analyses of the
effects of prevention and promotion programs to prevent mental health, substance
use and conduct problems. The review of 48 meta-analyses found small but
significant effects to reduce depression, anxiety, anti-social behavior and
substance use. Further, the effects are sustained over time. Meta-analyses often
found that the effects were heterogeneous. A conceptual model is proposed to
guide the study of moderators of program effects in future meta-analyses and
methodological issues in synthesizing findings across preventive interventions
are discussed.
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