The Dodo Bird Verdict–controversial, inevitable and important: a commentary on 30 years of meta-analyses

Budd, Rick; Hughes, Ian

doi:10.1002/cpp.648

Cited by 149Psychotherapy Techniques and ApplicationsMeta-analysis and systematic reviewsPsychology Research and Bibliometrics

The Dodo Bird Verdict–controversial, inevitable and important: a commentary on 30 years of meta-analyses

Budd, Rick, Hughes, Ian·2009·Clinical Psychology & Psychotherapy

DOI 10.1002/cpp.648

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Abstract

In this article, the assertion that different psychological therapies are of broadly similar efficacy-often called the 'Dodo Bird Verdict'-is contrasted with the alternative view that there are specific therapies that are more effective than others for particular diagnoses. We note that, despite thirty years of meta-analytic reviews tending to support the finding of therapy equivalence, this view is still controversial and has not been accepted by many within the psychological therapy community; we explore this from a theory of science perspective. It is further argued that the equivalence of ostensibly different therapies is an inevitable consequence of the methodology that has dominated this field of investigation; namely, randomised controlled trials [RCTs]. The implicit assumptions of RCTs are analysed and it is argued that what we know about psychological therapy indicates that it is not appropriate to treat 'type of therapy' and 'diagnosis' as if they were independent variables in an experimental design. It is noted that one logical consequence of this is that we would not expect RCTs to be capable of isolating effects that are specific to 'type of therapy' and 'diagnosis'. Rather, RCTs would only be expected to be capable of identifying the non-specific effects of covariates, such as those of therapist allegiance. It is further suggested that those non-specific effects that have been identified via meta-analysis are not trivial findings, but rather characterise important features of psychological therapy.

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It is difficult to find advantages for psychological treatments over active control treatments.
“given the known difficulty in finding advantages for psychological treatments over active control treatments [29].”
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Authors: Budd, R., & Hughes, I.
Affiliations: Maindiff Court Hospital (GB)
Cardiff and Vale University Health Board (GB)
Corresponding author: Hughes, Ian
Venue: Clinical Psychology & Psychotherapy
Publisher: Wiley
Published: 2009-09-02
Volume: 16
Issue: 6
Pages: 510-522
ISSN: 1063-3995 (ISSN-L)
1099-0879
DOI: 10.1002/cpp.648
OpenAlex: W1999117020
Cited by: 149
References: 89
Citations by year: 2026: 8 · 2025: 4 · 2024: 8 · 2023: 5 · 2022: 11 · 2021: 10 · 2020: 11 · 2019: 12 · 2018: 15 · 2017: 10 · 2016: 10 · 2015: 13 · 2014: 8 · 2013: 13 · 2012: 6
FWCI: 3.88
Type: journal article
Language: en
Open access: closed
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Locations: Clinical Psychology & Psychotherapy (publishedVersion)
PubMed (publishedVersion)
Topics: Social Sciences › Psychology › Clinical Psychology › Psychotherapy Techniques and Applications
Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Meta-analysis and systematic reviews
Social Sciences › Psychology › Experimental and Cognitive Psychology › Psychology Research and Bibliometrics
Keywords: randomized controlled trials, non-specific effects, theory of science, methodological critique
MeSH terms: Anxiety Disorders, Mental Disorders, Depressive Disorder, Humans, Individuality, Outcome and Process Assessment, Health Care, Professional-Patient Relations, Psychotherapy, Meta-Analysis as Topic, Observer Variation, Cognitive Behavioral Therapy, Randomized Controlled Trials as Topic, Evidence-Based Medicine

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The Dodo Bird Verdict–controversial, inevitable and important: a commentary on 30 years of meta-analyses

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