Therapist effects on treatment outcome in psychotherapy : a multilevel modelling analysis

Berglar, Jessica; Crameri, Aureliano; von Wyl, Agnes; Koemeda-Lutz, Margrit; Köhler, Miriam; Staczan, Pia; Schulthess, Peter; Tschuschke, Volker

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Therapist effects on treatment outcome in psychotherapy : a multilevel modelling analysis
Authors:	Berglar, Jessica Crameri, Aureliano von Wyl, Agnes Koemeda-Lutz, Margrit Köhler, Miriam Staczan, Pia Schulthess, Peter Tschuschke, Volker
Published in:	International Journal of Psychotherapy
Volume(Issue):	20
Issue:	2
Page(s):	61
Pages to:	80
Issue Date:	Jul-2016
Publisher / Ed. Institution:	Taylor & Francis
ISSN:	1356-9082 1469-8498
Language:	English
Subjects:	Effect of psychotherapist; Process-outcome research; Treatment outcome in psychotherapy
Subject (DDC):	616.89: Mental disorders, clinical psychology and psychiatry
Abstract:	Objectives: This study investigated specific and nonspecific therapeutic factors by focusing on therapist effects on treatment outcome. Methods: Psychotherapists (n = 68) from 10 types of psychotherapy treating 237 patients in an effectiveness study were investigated with regard to their contribution to treatment outcome. Factor scores from a factor analysis of the change scores in all outcome measures were cluster analysed in order to generate clusters of differently effective therapists. Results: Two clusters of differently effective therapists emerged. A fixed effects model revealed a significant impact of differential therapist effectiveness on treatment outcome. In addition to therapists’ differential effectiveness, also nonspecific factors such as patients severity of psychological problems predicted treatment outcome significantly. Treatment concepts did not impact therapists’ effectiveness. Conclusions: The results of this study support the view that there are differently effective therapists, but that patient characteristics also contribute significantly to the course of a psychotherapeutic treatment, independently of therapist.
URI:	https://digitalcollection.zhaw.ch/handle/11475/3307
Fulltext version:	Published version
License (according to publishing contract):	Not specified
Departement:	Applied Psychology
Organisational Unit:	Psychological Institute (PI)
Published as part of the ZHAW project:	Praxisstudie ambulante Psychotherapie (PAP-S)
Appears in collections:	Publikationen Angewandte Psychologie

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Berglar, J., Crameri, A., von Wyl, A., Koemeda-Lutz, M., Köhler, M., Staczan, P., Schulthess, P., & Tschuschke, V. (2016). Therapist effects on treatment outcome in psychotherapy : a multilevel modelling analysis. International Journal of Psychotherapy, 20(2), 61–80.

Berglar, J. et al. (2016) ‘Therapist effects on treatment outcome in psychotherapy : a multilevel modelling analysis’, International Journal of Psychotherapy, 20(2), pp. 61–80.

J. Berglar et al., “Therapist effects on treatment outcome in psychotherapy : a multilevel modelling analysis,” International Journal of Psychotherapy, vol. 20, no. 2, pp. 61–80, Jul. 2016.

BERGLAR, Jessica, Aureliano CRAMERI, Agnes VON WYL, Margrit KOEMEDA-LUTZ, Miriam KÖHLER, Pia STACZAN, Peter SCHULTHESS und Volker TSCHUSCHKE, 2016. Therapist effects on treatment outcome in psychotherapy : a multilevel modelling analysis. International Journal of Psychotherapy. Juli 2016. Bd. 20, Nr. 2, S. 61–80

Berglar, Jessica, Aureliano Crameri, Agnes von Wyl, Margrit Koemeda-Lutz, Miriam Köhler, Pia Staczan, Peter Schulthess, and Volker Tschuschke. 2016. “Therapist Effects on Treatment Outcome in Psychotherapy : A Multilevel Modelling Analysis.” International Journal of Psychotherapy 20 (2): 61–80.

Berglar, Jessica, et al. “Therapist Effects on Treatment Outcome in Psychotherapy : A Multilevel Modelling Analysis.” International Journal of Psychotherapy, vol. 20, no. 2, July 2016, pp. 61–80.