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Besides supply reduction, preventive interventions to reduce harm from gambling include interventions for the reduction of demand and to limit negative consequences. Several interventions are available for gamblers, e.g. limit-setting. Reviews have been published examining the evidence for specific measures as well as evaluating the effect of different measures at an overall level. Only a few of these have used a systematic approach for their literature review. The aim of this systematic review and meta-analysis is twofold. First, to assess the certainty of evidence of different preventive measures in the field of educational programs and consumer protection measures, including both land-based and online gambling. The second is to present shortcomings in eligible studies to highlight what type of information is needed in future studies. This systematic review included measures administered in both real-life settings and online. Twenty-eight studies fulfilled our inclusion criteria and had low or moderate risk of bias. The results showed that only two measures (long term educational programs and personalized feed-back) had an impact on gambling behavior. Follow-up period was short, and measures did not include gambling as a problem. The certainty in most outcomes, according to GRADE, was very low. Several shortcomings were found in the studies. We concluded that the support for preventive measures is low and that a consensus statement regarding execution and methods to collect and analyze data for preventive gambling research is needed. Our review can serve as a starting point for future responsible gambling reviews since it evaluated certainty of evidence.
Forsström et al. (Fri,) studied this question.
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