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Regular Article

A Meta-Analysis of the Efficacy of Acceptance and Commitment Therapy for Clinically Relevant Mental and Physical Health Problems

A-Tjak J.G.L.a · Davis M.L.c · Morina N.b · Powers M.B.c · Smits J.A.J.c · Emmelkamp P.M.G.b, d

Author affiliations

aPsyQ, Zaandam, and bDepartment of Clinical Psychology, University of Amsterdam, Amsterdam, The Netherlands; cDepartment of Psychology, University of Texas, Austin, Tex., USA; dCenter for Social and Humanities Research, King Abdulaziz University, Jeddah, Saudi Arabia

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Psychother Psychosom 2015;84:30-36

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Article / Publication Details

First-Page Preview
Abstract of Regular Article

Received: January 26, 2014
Accepted: July 04, 2014
Published online: December 24, 2014
Issue release date: January 2015

Number of Print Pages: 7
Number of Figures: 2
Number of Tables: 0

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

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

Abstract

Background: The current study presents the results of a meta-analysis of 39 randomized controlled trials on the efficacy of acceptance and commitment therapy (ACT), including 1,821 patients with mental disorders or somatic health problems. Methods: We searched PsycINFO, MEDLINE and the Cochrane Central Register of Controlled Trials. Information provided by the ACBS (Association of Contextual Behavioral Science) community was also included. Statistical calculations were conducted using Comprehensive Meta-Analysis software. Study quality was rated using a methodology rating form. Results: ACT outperformed control conditions (Hedges' g = 0.57) at posttreatment and follow-up assessments in completer and intent-to-treat analyses for primary outcomes. ACT was superior to waitlist (Hedges' g = 0.82), to psychological placebo (Hedges' g = 0.51) and to treatment as usual (TAU) (we defined TAU as the standard treatment as usual; Hedges' g = 0.64). ACT was also superior on secondary outcomes (Hedges' g = 0.30), life satisfaction/quality measures (Hedges' g = 0.37) and process measures (Hedges' g = 0. 56) compared to control conditions. The comparison between ACT and established treatments (cognitive behavioral therapy) did not reveal any significant differences between these treatments (p = 0.140). Conclusions: Our findings indicate that ACT is more effective than treatment as usual or placebo and that ACT may be as effective in treating anxiety disorders, depression, addiction, and somatic health problems as established psychological interventions. More research that focuses on quality of life and processes of change is needed to understand the added value of ACT and its transdiagnostic nature.

© 2014 S. Karger AG, Basel


References

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  3. Powers MB, Zum Vörde Sive Vörding MB, Emmelkamp PMG: Acceptance and commitment therapy: a meta-analytic review. Psychother Psychosom 2009;78:73-80.
  4. Ruiz F: Acceptance and commitment therapy versus traditional cognitive behavioral therapy: a systematic review and meta-analysis of current empirical evidence. Int J Psychol Psychol Ther 2012;12:333-357.
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    External Resources
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  19. Levin ME, Hildebrandt MJ, Lillis J, Hayes SC: The impact of treatment components suggested by the psychological flexibility model: a meta-analysis of laboratory-based component studies. Behav Ther 2012;43:741-756.

Article / Publication Details

First-Page Preview
Abstract of Regular Article

Received: January 26, 2014
Accepted: July 04, 2014
Published online: December 24, 2014
Issue release date: January 2015

Number of Print Pages: 7
Number of Figures: 2
Number of Tables: 0

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

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


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