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Adherence Rating Scale for Cognitive Processing Therapy - Cognitive Only: Analysis of Psychometric Properties
Clara Dittmann1, Meike Müller-Engelmann1, Patricia A Resick2
1Goethe University,Department of Clinical Psychology and Intervention,Frankfurt Main,Germany.
A new scale reliably measures adherence to Cognitive Processing Therapy - Cognitive Only (CPT) for PTSD and borderline personality disorder symptoms. This tool aids in interpreting treatment outcomes and understanding adherence effects.
Area of Science:
- Psychotherapy research
- Clinical psychology
- Mental health treatment
Background:
- Therapeutic adherence assessment is crucial for psychotherapy research but often overlooked.
- Accurate interpretation of treatment outcomes relies on adherence data.
Purpose of the Study:
- Develop and validate a scale to measure adherence to Cognitive Processing Therapy - Cognitive Only (CPT).
- Adapt the CPT adherence scale for a study on post-traumatic stress disorder (PTSD) with co-occurring borderline personality symptoms.
Main Methods:
- Two independent raters evaluated 30 therapy sessions from a multicentre randomized controlled trial.
- Sessions involved seven therapists and eight patients undergoing adapted CPT.
Main Results:
- The adherence scale demonstrated good to excellent inter-rater reliability (ICC = 0.70–1.00).
- Cronbach's alpha for the scale was .56, and expert review confirmed content validity.
- High reliability indicates the scale is a dependable measure of CPT adherence.
Conclusions:
- The developed adherence rating scale for adapted CPT is a reliable instrument.
- This scale can enhance the interpretation of treatment effects in clinical trials.
- It facilitates analysis of the relationship between adherence and outcomes and aids in skills training.
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