Group therapy for mood disorders: A meta-analysis.

The addition of group psychotherapy as a specialty by the APA in 2018 creates a need for rigorous empirical reviews of group treatments for specific disorders. We conducted a meta-analysis of randomized controlled trials (RCTs) that tested the effect of group psychotherapy for mood disorders, including depression and bipolar disorder, at posttreatment and follow-up time-points, as well as rates of recovery and attrition. Major databases were searched for RCTs of group treatment for depression and bipolar disorder published from 1990 to 2018, which identified 42 studies across both disorders.

Group therapy for schizophrenia: A meta-analysis.

The effectiveness of group treatments for people with schizophrenia has not been examined on symptom-specific (positive and negative symptoms) outcomes, and the differential effects of the most popular group treatments remain unknown. We conducted a meta-analysis of randomized controlled trials that tested (a) the effectiveness of 7 frequently used group treatments on positive and negative symptoms and (b) if treatment-specific outcome improvement was associated with improvement on schizophrenia symptoms. Major databases were searched from 1990 to 2018 for randomized controlled trials of group treatment for people with schizophrenia, including first-episode psychosis.