Aim of this study is to investigate the effectiveness of different batterer intervention programs in reducing violence for male IPV perpetrators. The Cochrane Handbook for Systemic Reviews of Interventions guidelines for the process of conducting systematic reviews and meta-analysis were followed. Pooled together, overall these various intervention programs are effective in reducing violence for male perpetrators of IPV comparing post to pre-intervention [(pooled estimate = -0.85; 95%

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... Interval (CI) (-1.02 to -0.69)]. Exploratory subgroup analysis revealed that incorporating substance abuse or trauma components to the interventions yielded better results (substance abuse: CI = -3.20 to -1.08 and trauma: CI = -2.63 to -0.30) as compared to programs that did not have these components. Gender-role based batterer intervention programs yielded mixed results. Analysis of the three controlled studies with 223 participants comparing batterer programs to a minimal control group showed mixed effects. In conclusion, treatment strategies that are addressing highly comorbid issues such as substance abuse and trauma issues may work more effectively in preventing violence.