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To address the societal harms of violence, many violence prevention interventions have been developed, tested, and implemented in the general population. These have been reported in systematic reviews and meta-analyses, which have typically focused on one type of intervention or outcome. We aimed to provide a comprehensive overview of the current evidence regarding the effectiveness of different psychosocial interventions in reducing all forms of violence toward others. We have conducted an umbrella review of previous meta-analyses using standard approaches and converted findings on effectiveness into odds ratios. We tested for the underlying quality of the meta-analytic evidence by examining heterogeneity, excess statistical significance, prediction intervals, and small study effects. We identified 16 meta-analyses, including nine investigating psychosocial interventions, and five legislative and policy changes. Most meta-analyses reported positive effects of tested interventions. The strongest effects were found for sports-based initiatives, and the weakest for general population programs aimed at early childhood, youth development, and reducing sexual assault perpetration by men. Legislative changes had varying effectiveness. We conclude that simple, scalable, and cost-efficient programs, such as sport-based initiatives, have the clearest empirical support as population-based approaches to violence prevention., Competing Interests: Declaration of Conflicting InterestsThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

The risk of violence following childhood maltreatment is uncertain. This meta-analytic review identified prospective studies that have examined this association. We systematically searched three electronic databases (PsycINFO, EMBASE, and MEDLINE) and completed a targeted search on Google Scholar. These were supplemented with scanning reference lists and correspondence with authors. We considered non-English-language and unpublished studies. Studies were included if childhood maltreatment was measured before age 18 years and occurred before violent outcomes. We identified 18 eligible studies with data on 39,271 participants. We conducted meta-analysis to calculate odds ratios ( OR s) using random-effects models. Heterogeneity was explored through subgroup analyses and meta-regression. The overall OR of violent outcomes in childhood maltreatment was 1.8 (95% confidence interval [1.4, 2.3]) with substantial heterogeneity ( I 2 = 92%). Meta-regression suggested that risk of violence following childhood maltreatment was more elevated in samples with higher percentage of females, in higher quality investigations, in studies with case-linkage methods compared to that followed-up participants over time using a prospective cohort design, when general population or matched controls were used rather than selected population controls, and when violent outcomes were ascertained in older individuals. In conclusion, the risk of later violence perpetration was modestly increased in individuals with a history of childhood maltreatment. Preventative strategies and interventions for childhood maltreatment may have an important role in violence reduction. Methodological issues and recommendations for future research are discussed.