Descriptions or mechanisms that relied on the interpretation and opinion of the authors were treated as theoretical insights (hypotheses), rather than evidence. We employed snowball sampling to identify additional studies for further explanation building, such as tracking references in footnotes, endnotes, and references of potentially relevant articles. The protocol was registered in the Prospero database (CRD42015024511). For the quantitative evidence, we report impacts for all qualifying IPV indicators analyzed as part of the study, however we do not present results for each sub-sample or heterogeneity analysis. In addition, the choice of which subsample analysis is explored is left to authors, thus we may not capture an unbiased picture of potential heterogeneous effects when comparing results side by side. Finally, the methodology utilized to analyze subsamples varies by study.