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Cognitive Therapy and Research

, Volume 42, Issue 4, pp 385–397 | Cite as

The Cognitive Therapy Scale and Cognitive Therapy Scale-Revised as Measures of Therapist Competence in Cognitive Behavior Therapy for Depression: Relations with Short and Long Term Outcome

  • Nikolaos Kazantzis
  • Xavier Clayton
  • Timothy. J. Cronin
  • Davide Farchione
  • Karina Limburg
  • Keith. S. Dobson
Original Article

Abstract

Therapist competence is an important factor in treatment integrity. This study reports on a direct comparison of the original Cognitive Therapy Scale (CTS) with the revised version, the Cognitive Therapy Scale-Revised (CTS-R), as observational instruments designed to evaluate therapist competence in a completed trial of Cognitive Behavior Therapy (CBT) for depression. Treatment sessions (N = 94) from 50 depressed participants (M age = 39.2 years, 76% female, with an average of 5.9 depressive episodes) were evaluated on the CTS and CTS-R by trained independent observers who were blind to treatment outcome, as well as to subject, and session numbers. A comprehensive training program and inter-rater reliability monitoring protocol were employed. Two models were used to compare CTS and CTS-R in relation to change in depression symptoms at termination, 12 and 24 month follow-up while controlling for pre-treatment depression levels and working alliance. Both the CTS and CTS-R demonstrated comparable internal reliability, interrater reliability, and when assessed in early treatment phase, both predicted a statistically significant reduction in depressive symptomatology at termination. No significant competence-outcome relations were detected with late CTS and CTS-R ratings, and the significant positive interaction terms indicated relations with depressive symptomatology were not maintained at follow-up. Given these findings, we encourage future research to examine specific competence domains and “therapist drift” with an increased number of session assessments.

Keywords

Cognitive Behavior Therapy Therapist competence Major depressive disorder Cognitive Therapy Scale Cognitive Therapy Scale-Revised 

Notes

Funding

Funding was provided by Helen Macpherson Smith Trust and National Institute of Mental Health.

Compliance with Ethical Standards

Conflict of interest

The authors state that there are no conflicts of interests to disclose in this submitted work to Cognitive Therapy & Research.

Ethical Approval

This research was reviewed and approved by the Monash University Human Ethics Committee (Project ID #2589). The parent study was conducted at the University of Washington (Jacobson et al., 1996) and had received prior ethical approval.

Informed Consent

All research participants provided informed consent prior to participation. All procedures performed were in accordance with the ethical standards of the institutional research committees and with the 1964 Helsinki declaration and its later amendments. In addition, the attribution of authorship on this manuscript has also been carefully considered and is being made in a manner that is consistent with ethical research practice.

Animal Rights

No animal studies were carried out by the authors for this article.

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Authors and Affiliations

  1. 1.Cognitive Behavior Therapy Research Unit, School of Psychological SciencesMonash UniversityMelbourneAustralia
  2. 2.Department of Mathematics and StatisticsLa Trobe UniversityMelbourneAustralia
  3. 3.Department of Psychosomatic Medicine and PsychotherapyTechnische UniversitätMunichGermany
  4. 4.Department of PsychologyUniversity of CalgaryCalagryCanada

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