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Adherence Rating Scale for Cognitive Processing Therapy – Cognitive Only: Analysis of Psychometric Properties

Published online by Cambridge University Press:  21 February 2017

Clara Dittmann*
Affiliation:
Goethe University, Department of Clinical Psychology and Intervention, Frankfurt Main, Germany
Meike Müller-Engelmann
Affiliation:
Goethe University, Department of Clinical Psychology and Intervention, Frankfurt Main, Germany
Patricia A. Resick
Affiliation:
Department of Psychiatry and Behavioral Sciences, Duke University, Durham, North Carolina, USA
Jana Gutermann
Affiliation:
Goethe University, Department of Clinical Psychology and Intervention, Frankfurt Main, Germany
Ulrich Stangier
Affiliation:
Goethe University, Department of Clinical Psychology and Intervention, Frankfurt Main, Germany
Kathlen Priebe
Affiliation:
Humboldt University of Berlin, Department of Psychotherapy and Somatic Psychology, Berlin, Germany
Thomas Fydrich
Affiliation:
Humboldt University of Berlin, Department of Psychotherapy and Somatic Psychology, Berlin, Germany
Petra Ludäscher
Affiliation:
Central Institute of Mental Health, University of Mannheim/Heidelberg, Department of Psychosomatic Medicine and Psychotherapy, Mannheim, Germany
Julia Herzog
Affiliation:
Central Institute of Mental Health, University of Mannheim/Heidelberg, Department of Psychosomatic Medicine and Psychotherapy, Mannheim, Germany
Regina Steil
Affiliation:
Goethe University, Department of Clinical Psychology and Intervention, Frankfurt Main, Germany
*
*Correspondence to Clara Dittmann, Department of Clinical Psychology and Intervention, Goethe University Frankfurt, Institute of Psychology, Varrentrappstraße 40–42. E-mail: [email protected]

Abstract

Background: The assessment of therapeutic adherence is essential for accurately interpreting treatment outcomes in psychotherapy research. However, such assessments are often neglected. Aims: To fill this gap, we aimed to develop and test a scale that assessed therapeutic adherence to Cognitive Processing Therapy – Cognitive Only (CPT), which was adapted for a treatment study targeting patients with post-traumatic stress disorder and co-occurring borderline personality symptoms. Method: Two independent, trained raters assessed 30 randomly selected treatment sessions involving seven therapists and eight patients who were treated in a multicentre randomized controlled trial. Results: The inter-rater reliability for all items and the total score yielded good to excellent results (intraclass correlation coefficient [ICC] = 0.70 to 1.00). Cronbach's α was .56 for the adherence scale. Regarding content validity, three experts confirmed the relevance and appropriateness of each item. Conclusion: The adherence rating scale for the adapted version of CPT is a reliable instrument that can be helpful for interpreting treatment effects, analysing possible relationships between therapeutic adherence and treatment outcomes and teaching therapeutic skills.

Type
Brief Clinical Reports
Copyright
Copyright © British Association for Behavioural and Cognitive Psychotherapies 2017 

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