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We included 50 between-group studies with control groups and 7 studies with only within-group data in a meta-analysis of adult anger treatments. Overall, we examined 92 treatment interventions that incorporated 1,841 subjects. Results showed that subjects who received treatment showed significant and moderate improvement compared to untreated subjects and a large amount of improvement when compared to pretest scores. In the group of controlled studies significant heterogeneity of variance and significant differences among effect sizes for different dependent variable categories were found. Anger interventions produced reductions in the affect of anger, reductions in aggressive behaviors, and increases in positive behaviors. An analysis of follow-up data suggested that treatment gains were maintained.
DiGiuseppe et al. (2003) studied this question.