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Recent reviews of the group psychotherapy literature indicate that group is a beneficial and cost-effective treatment format. However, collective findings on the differential efficacy of group when compared with individual therapy remain problematic, incomplete, or controversial. To remedy this problem, the authors conducted a meta-analysis of 23 outcome studies that directly compared the effectiveness of the individual and group therapy formats when they were used within the same study. Results were consistent with previous reports that indicated no difference in outcome between the group and individual formats. This finding generally held true when client, therapist, methodology, treatment, and group variables were examined for possible relationship with effect sizes comparing group and individual therapy. Results bolster past findings that group therapy can be used as an efficacious cost-effective alternative to individual therapy under many different conditions.
McRoberts et al. (Mon,) studied this question.