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The psychotherapy dose-response effect and its implications for treatment delivery services.

Hansen, Nathan B., Lambert, Michael J., Forman, Evan M.·2002·Clinical Psychology: Science and Practice

DOI 10.1093/clipsy.9.3.329

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Abstract

To date, few studies have been published on the doseresponse relationship, but there is general consensus that between 13 and 18 sessions of therapy are required for 50% of patients to improve. Reviewing the clinical trials literature reveals that in carefully controlled and implemented treatments, between 57.6% and 67.2% of patients improve within an average of 12.7 sessions. Using naturalistic data, however, revealed that the average number of sessions received in a national database of over 6,000 patients was less than five. The rate of improvement in this sample was only about 20%. These results suggest that patients, on average, do not get adequate exposure to psychotherapy, nor do they recover from illness at rates observed in clinical trials research.

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Authors: Hansen, N. B., Lambert, M. J., & Forman, E. M.
Affiliations: Yale University (US)
Brigham Young University (US)
Drexel University (US)
ORCID: Hansen, Nathan B.
Lambert, Michael J.
Forman, Evan M.
Venue: Clinical Psychology: Science and Practice
Publisher: American Psychological Association (APA)
Published: 2002
Volume: 9
Issue: 3
Pages: 329-343
ISSN: 0969-5893 (ISSN-L)
1468-2850
DOI: 10.1093/clipsy.9.3.329
OpenAlex: W2114544903
Semantic Scholar: 1968734f94d02eb6e4d193bdfdd42f5931ab250d
Cited by: 783
References: 102
Citations by year: 2026: 18 · 2025: 14 · 2024: 25 · 2023: 28 · 2022: 34 · 2021: 45 · 2020: 54 · 2019: 43 · 2018: 72 · 2017: 41 · 2016: 35 · 2015: 45 · 2014: 50 · 2013: 47 · 2012: 45
FWCI: 15.06
Type: journal article
Language: en
Open access: closed
Licence: doi.wiley.com/10.1002/tdm_license_1.1 (tdm, 4991 d)
Locations: Clinical Psychology Science and Practice (publishedVersion)
Topics: Social Sciences › Psychology › Clinical Psychology › Psychotherapy Techniques and Applications
Health Sciences › Medicine › Psychiatry and Mental health › Mental Health Treatment and Access
Social Sciences › Psychology › Applied Psychology › Digital Mental Health Interventions
Keywords: number of treatment sessions, treatment outcomes, naturalistic data, psychotherapy utilization

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The psychotherapy dose-response effect and its implications for treatment delivery services.

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