liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
The effects of psychotherapy for adult depression are overestimated: a meta-analysis of study quality and effect size
Vrije University Amsterdam.
Vrije University Amsterdam.
Technical University of Twente.
Vanderbilt University.
Show others and affiliations
2010 (English)In: PSYCHOLOGICAL MEDICINE, ISSN 0033-2917, Vol. 40, no 2, 211-223 p.Article in journal (Refereed) Published
Abstract [en]

Background. No meta-analytical study has examined whether the quality of the Studies examining psychotherapy for adult depression is associated with the effect sizes found. This study assesses this association. Method. We used a database of 115 randomized controlled trials in which 178 psychotherapies for adult depression were compared to a control condition. Eight quality criteria were assessed by two independent coders: participants met diagnostic criteria for a depressive disorder, a treatment manual was used, the therapists were trained, treatment integrity was checked, intention-to-treat analyses were used, N andgt;= 50, randomization was Conducted by an independent party, and assessors of outcome were blinded. Results. Only 11 studies (16 comparisons) met the eight quality criteria. The standardized mean effect size found for the high-quality studies (d=0.22) was significantly smaller than in the other Studies (d=0.74, pandlt;0.001), even after restricting the sample to the Subset of other studies that used the kind of care-as-usual or non-specific controls that tended to be used in the high-quality studies. Heterogeneity was zero in the group of high-quality studies. The numbers needed to be treated in the high-quality studies was 8, while it was 2 in the lower-quality Studies. Conclusions. We found strong evidence that the effects of psychotherapy for adult depression have been overestimated in meta-analytical studies. Although the effects of psychotherapy are significant, the), are Much smaller than was assumed until now, even after controlling for the type of control condition used.

Place, publisher, year, edition, pages
2010. Vol. 40, no 2, 211-223 p.
Keyword [en]
Depression, major depressive disorder, meta-analysis, psychotherapy, psychological treatments
National Category
Social Sciences
URN: urn:nbn:se:liu:diva-54149DOI: 10.1017/S0033291709006114ISI: 000274422600005OAI: diva2:300402
Available from: 2010-02-26 Created: 2010-02-26 Last updated: 2014-11-28

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Andersson, Gerhard
By organisation
Clinical and Social PsychologyFaculty of Arts and Sciences
Social Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 45 hits
ReferencesLink to record
Permanent link

Direct link