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      Patterns of therapist variability: Therapist effects and the contribution of patient severity and risk.

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      Journal of Consulting and Clinical Psychology
      American Psychological Association (APA)

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          Abstract

          To investigate the size of therapist effects using multilevel modeling (MLM), to compare the outcomes of therapists identified as above and below average, and to consider how key variables--in particular patient severity and risk and therapist caseload--contribute to therapist variability and outcomes. We used a large practice-based data set comprising patients referred to the U.K.'s National Health Service primary care counseling and psychological therapy services between 2000 and 2008. Patients were included if they had received ≥2 sessions of 1-to-1 therapy (including an assessment), had a planned ending to treatment, and completed the Clinical Outcomes in Routine Evaluation-Outcome Measure (CORE-OM; Barkham et al., 2001; Barkham, Mellor-Clark, Connell, & Cahill, 2006; Evans et al., 2002) at pre- and post-treatment. The study sample comprised 119 therapists and 10,786 patients, whose mean age was 42.1 years (71.5% were female). MLM, including Markov chain Monte Carlo procedures, was used to derive estimates to produce therapist effects and to analyze therapist variability. The model yielded a therapist effect of 6.6% for average patient severity, but it ranged from 1% to 10% as patient non-risk scores increased. Recovery rates for individual therapists ranged from 23.5% to 95.6%, and greater patient severity and greater levels of aggregated patient risk in a therapist's caseload were associated with poorer outcomes. The size of therapist effect was similar to those found elsewhere, but the effect was greater for more severe patients. Differences in patient outcomes between those therapists identified as above or below average were large, and greater therapist risk caseload, rather than non-risk caseload, was associated with poorer patient outcomes. © 2012 American Psychological Association

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          Author and article information

          Journal
          Journal of Consulting and Clinical Psychology
          Journal of Consulting and Clinical Psychology
          American Psychological Association (APA)
          1939-2117
          0022-006X
          2012
          2012
          : 80
          : 4
          : 535-546
          Article
          10.1037/a0028898
          22663902
          f39f4efc-576b-4d69-97e6-19cdafa6d67b
          © 2012
          History

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