Reliability of Therapist Effects in Practice-Based Psychotherapy Research: A Guide for the Planning of Future Studies

Anne-Katharina Schiefele, Wolfgang Lutz, Michael Barkham, Julian Rubel, Jan Böhnke, Jaime Delgadillo, Mark Kopta, Dietmar Schulte, David Saxon, Stevan L. Nielsen, Michael J. Lambert

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    This paper aims to provide researchers with practical information on sample sizes for accurate estimations of therapist effects (TEs). The investigations are based on an integrated sample of 48,648 patients treated by 1800 therapists. Multilevel modeling and resampling were used to realize varying sample size conditions to generate empirical estimates of TEs. Sample size tables, including varying sample size conditions, were constructed and study examples given. This study gives an insight into the potential size of the TE and provides researchers with a practical guide to aid the planning of future studies in this field.
    Original languageEnglish
    Pages (from-to)598-613
    Number of pages6
    JournalAdministration and Policy in Mental Health and Mental Health Services Research
    Issue number5
    Early online date5 May 2016
    Publication statusPublished - Sep 2017



    • Therapist effects
    • Naturalistic data
    • Multilevel analysis
    • Sample size
    • Practical guide

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