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Table of Contents
Vol. 78, No. 2, 2009
Issue release date: March 2009
Section title: Special Article
Psychother Psychosom 2009;78:73–80
(DOI:10.1159/000190790)

Acceptance and Commitment Therapy: A Meta-Analytic Review

Powers M.B. · Zum Vörde Sive Vörding M.B. · Emmelkamp P.M.G.
Faculty of Social and Behavioral Sciences, Clinical Psychology, University of Amsterdam, Amsterdam, The Netherlands

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Article / Publication Details

First-Page Preview
Abstract of Special Article

Received: 4/14/2008
Accepted: 7/27/2008
Published online: 1/14/2009

Number of Print Pages: 8
Number of Figures: 1
Number of Tables: 1

ISSN: 0033-3190 (Print)
eISSN: 1423-0348 (Online)

For additional information: http://www.karger.com/PPS

Abstract

Background: There are now a substantial number of controlled trials investigating the efficacy of acceptance and commitment therapy (ACT). This meta-analysis combined multiple well-controlled studies to help clarify the overall impact of ACT relative to waiting lists, psychological placebos, treatment as usual, and established therapies. Method: A comprehensive literature search produced 18 randomized controlled trials (n = 917) that were included in the final analyses. Effect size was computed with Hedges’s g which can be interpreted with Cohen’s convention of small (0.2), medium (0.5), and large (0.8) effects. Results: There was a clear overall advantage of ACT compared to control conditions (effect size = 0.42). The average ACT-treated participant was more improved than 66% of the participants in the control conditions. Analyzed separately ACT was superior to waiting lists and psychological placebos (effect size = 0.68) and treatment as usual (effect size = 0.42). However, ACT was not significantly more effective than established treatments (effect size = 0.18, p = 0.13). Also, ACT was not superior to control conditions for the distress problems (anxiety/depression: effect size = 0.03, p = 0.84). Conclusions: The results reveal that ACT is more effective than control conditions for several problem domains, but there is no evidence yet that ACT is more effective than established treatments.


Article / Publication Details

First-Page Preview
Abstract of Special Article

Received: 4/14/2008
Accepted: 7/27/2008
Published online: 1/14/2009

Number of Print Pages: 8
Number of Figures: 1
Number of Tables: 1

ISSN: 0033-3190 (Print)
eISSN: 1423-0348 (Online)

For additional information: http://www.karger.com/PPS


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in goverment regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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