Dose–effect relationship in routine outpatient psychotherapy: Does treatment duration matter?
Publisher DOI
Abstract
Objective: There is an ongoing debate concerning how outcome variables change during the course of psychotherapy. We compared the dose–effect model, which posits diminishing effects of additional sessions in later treatment phases, against a model that assumes a linear and steady treatment progress through termination. Method: Session-by-session outcome data of 6,375 outpatients were analyzed, and participants were categorized according to treatment length. Linear and log-linear (i.e., negatively accelerating) latent growth curve models (LGCMs) were estimated and compared for different treatment length categories. Results: When comparing the fit of the various models, the log-linear LGCMs assuming negatively accelerating treatment progress consistently outperformed the linear models irre- spective of treatment duration. The rate of change was found to be inversely related to the length of treatment. Conclusion: As proposed by the dose–effect model, the expected course of improvement in psychotherapy appears to follow a negatively accelerated pattern of change, irrespective of the duration of the treatment. However, our results also suggest that the rate of change is not constant across various treatment lengths. As proposed by the “good enough level” model, longer treatments are associated with less rapid rates of change.
Date Issued
2013
Publication Type
Article
Subject(s)
Language(s)
en
Author(s)
Lutz, Wolfgang | |
Kopta, Stephen Mark | |
Minami, Takuya | |
Saunders, Stephen M. |
Additional Credits
Journal
Journal of counseling psychology
Publisher
American Psychological Association
ISSN
0022-0167
Access(Rights)
metadata.only