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dc.date.accessioned2023-12-13T21:25:01Z
dc.date.available2023-12-13T21:25:01Z
dc.date.created2023-12-03T21:42:35Z
dc.date.issued2023
dc.identifier.citationNordahl-Hansen, Anders Cogo Moreira, Hugo Panjeh, Sareh Quintana, Daniel S. . Redefining effect size interpretations for psychotherapy RCTs in depression. Journal of Psychiatric Research. 2023, 169, 38-41
dc.identifier.urihttp://hdl.handle.net/10852/106330
dc.description.abstractIntroduction Effect sizes are often used to interpret the magnitude of a result and in power calculations when planning research studies. However, as effect size interpretations are context-dependent, Jacob Cohen's suggested guidelines for what represents a small, medium, and large effect are unlikely to be suitable for a diverse range of research populations and interventions. Our objective here is to determine empirically-derived effect size thresholds associated with psychotherapy randomized controlled trials (RCTs) in depression by calculating the effect size distribution. Methods We extracted effect sizes from 366 RCTs provided by the systematic review of Cuijpers and colleagues (2020) on psychotherapy for depressive disorders across all age groups. The 50th percentile effect size, as this represents a medium effect size, and the 25th (small) and 75th (large) percentile effect sizes were calculated to determine empirically-derived effect size thresholds. Results After adjusting for publication bias, 0.27, 0.53, and 0.86 represent small, medium, and large effect sizes, respectively, for psychotherapy treatment for depressive disorders. Discussion The effect size distribution for psychotherapy treatment of depression indicates that observed effect size thresholds are larger than Cohen's suggested effect size thresholds (0.2, 0.5, and 0.8). These results have implications for the interpretation of study effects and the planning of future studies via power analyses, which often use effect size thresholds.
dc.languageEN
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleRedefining effect size interpretations for psychotherapy RCTs in depression
dc.title.alternativeENEngelskEnglishRedefining effect size interpretations for psychotherapy RCTs in depression
dc.typeJournal article
dc.creator.authorNordahl-Hansen, Anders
dc.creator.authorCogo Moreira, Hugo
dc.creator.authorPanjeh, Sareh
dc.creator.authorQuintana, Daniel S.
cristin.unitcode185,53,46,3
cristin.unitnameK.G. Jebsen senter for utviklingsforstyrrelser
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin2207972
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Psychiatric Research&rft.volume=169&rft.spage=38&rft.date=2023
dc.identifier.jtitleJournal of Psychiatric Research
dc.identifier.volume169
dc.identifier.startpage38
dc.identifier.endpage41
dc.identifier.doihttps://doi.org/10.1016/j.jpsychires.2023.11.009
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn0022-3956
dc.type.versionPublishedVersion


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