3 years ago

Practitioner Review: Therapist variability, patient-reported therapeutic alliance, and clinical outcomes in adolescents undergoing mental health treatment – a systematic review and meta-analysis

Paul Hutton, Regina Murphy
Background Previous meta-analyses have only found small correlations (r = .10 to r = .19) between therapeutic alliance and clinical outcomes in samples of adolescents receiving psychological therapy. Although study-level variables have been found to moderate this, little is known about the impact of therapist variability. The present meta-analysis aimed to address this gap by using patient-therapist ratio as a moderator variable. Methods Contrary to previous reviews of adolescent alliance, individual effect sizes were extracted using a preregistered conceptual hierarchy. Controlling for treatment-level confounds, a random effects meta-analysis assessed the moderating effect of patient-therapist ratio on the alliance-outcome relationship in predefined single-predictor and multipredictor meta-regressions. Results The alliance-outcome relationship was found to be larger than previously thought (k = 28, N = 2,911, r = .29, 95% Confidence Interval 0.21, 0.37; p < .0001, I2 = 80%). When study samples exceeding the adolescent 12–19 age range were removed, the correlation rose (k = 15, N = 1,797, r = .34, 95% Confidence Interval 0.23, 0.45; p < .0001, I2 = 83%). In contrast to research with adults, patient-therapist ratio did not moderate this relationship in either single-predictor (p = .26) or multi-predictor (p = .22) models. Conclusions The alliance-outcome relationship for adolescents was larger than previously thought, and comparable to estimates in adult samples. The failure of patient-therapist ratio to moderate its strength, however, challenges the hypothesis that variability in therapist characteristics is an important determinant of the alliance-outcome effect in this age group.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1111/jcpp.12767

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