Outcome differences between individual and group formats when identical and nonidentical treatments, patients, and doses are compared: A 25-year meta-analytic perspective.

December 1, 2016Psychotherapy

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Key Points

This research aims to clarify the differences in treatment outcomes between individual and group therapy formats over 25 years.
Conducted a meta-analysis of 67 studies comparing individual and group formats of treatment.
Utilized within-study effect sizes to analyze treatment efficacy across formats for identical and nonidentical treatments.
Examined parameters like treatment acceptance, dropout rates, remission, and improvement across different patient diagnoses.
Identical treatments showed format equivalence with an effect size of g = -0.01 in 46 studies.
Nonidentical treatments yielded an effect size of g = -0.06 in 21 studies, influenced by allegiance to treatment format.
No significant differences were found in treatment outcomes based on patient diagnosis, though specific diagnoses affected improvement rates.

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Meta-analytic findings show no significant differences in treatment outcomes between individual and group formats, suggesting practical implications.

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Burlingame et al. (2016) studied this question.

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