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Summary of - Supervision in clinical psychology: a meta-analysis.
Title of Original: Supervision in clinical psychology: a meta-analysis
Authors: Klymenko I.S.; Haladza M.V.; Pysarenko T.V.
Journal: The Clinical Supervisor
DOI: https://doi.org/10.26565/2312-5675-2025-28-09
Original Language: Ukrainian
Why This Matters - Evidence shows clinical supervision modestly improves therapy outcomes, especially in trauma settings, supporting stronger training standards and better evaluation.
Read Time - 5 Minutes
The article presents a systematic review and meta-analysis examining supervision in clinical psychology as a component of professional training and practice. The focus is on supervision as a distinct professional competency and on evaluating its effectiveness, structure, and impact on psychotherapeutic outcomes, with particular attention to work conducted in contexts of psychological trauma, including wartime conditions.
In the introductory section, supervision is described as an integral element of clinical psychologists’ professional development and ongoing practice. It is framed as a structured process involving regular meetings between a supervisee and a more experienced supervisor, aimed at analysing clinical cases, ethical dilemmas, professional interactions, and work-related challenges. Despite its widespread recognition and use, the authors note that the empirical evidence base for supervision remains less developed than that for psychotherapeutic methods. Definitions of supervision vary across the literature, with some emphasizing skill and competency development, while others highlight hierarchical knowledge transfer. The introduction also differentiates supervision from related practices such as feedback and coaching. Previous reviews are discussed, with attention to their methodological limitations, including narrow focus, lack of adherence to systematic review standards, and limited empirical scope. The authors identify a need for a broader and methodologically rigorous synthesis of empirical findings.
The stated aim of the study is to systematize and analyse existing empirical data on supervision in clinical psychology through meta-analysis. The objectives include examining the effectiveness of supervision, its implementation characteristics, and its influence on clinical outcomes, particularly in work with military personnel, internally displaced persons, and civilians exposed to traumatic events.
The materials and methods section outlines a systematic review and meta-analytic design conducted in accordance with PRISMA standards. A retrospective analysis of the literature was undertaken using international databases, including MEDLINE (via PubMed), PsycINFO, Scopus, and Web of Science Core Collection. Publications from 2009 to 2024 in English, German, and Ukrainian were considered. Inclusion criteria comprised original empirical studies published in peer-reviewed journals that examined supervision in clinical psychology and assessed its outcomes. Studies without empirical evaluation, narrative reviews, conceptual articles, and papers describing supervision processes without outcome assessment were excluded. Methodological quality was evaluated using the CASP checklist for qualitative studies and the Jadad scale for randomized trials.
In the results section, the authors report that 11 empirical studies met inclusion criteria and were incorporated into the meta-analysis. From these studies, 32 primary effect sizes were identified, with 21 retained after aggregation. Over half of the effects related to the association between supervision and client treatment outcomes, while others addressed client satisfaction and therapeutic alliance. Descriptive characteristics indicate that studies were conducted across training clinics, multicentre settings, and rehabilitation or home-based programmes. Participants were predominantly female, with clients averaging 25.4 years of age, therapists 30 years, and supervisors 37.7 years.
The meta-analysis revealed a positive but moderate association between supervision quality and psychotherapeutic outcomes. The overall integrated effect size under a random-effects model was r = 0.21, corresponding to approximately 4% explained variance. When studies with potential evaluator bias were excluded, the effect size increased to r = 0.24, accounting for 6% of variance. Effects related to direct clinical outcomes were relatively stable, while those associated with client satisfaction and therapeutic alliance showed greater variability. Considerable variation was also observed across measures and outcome types, particularly when outcomes were rated by supervisors or therapists rather than clients.
Further analysis examined specific supervision characteristics, including supervisory alliance, supervision style, structure, tools, multicultural supervision, and satisfaction with supervision. These variables generally demonstrated small to moderate positive associations with outcomes and showed less variability than global supervision effects. Demographic comparisons highlighted similarities between international and Ukrainian samples, alongside contextual differences linked to wartime conditions and increased demand for psychological services.
In the conclusion, the authors state that supervision in clinical psychology demonstrates a consistent, though modest, positive association with psychotherapeutic outcomes. They note that research on supervision remains methodologically less developed than research on psychotherapy, underscoring the need for improved study designs and evaluation approaches. The findings are presented as relevant to current regulatory and professional requirements in mental health practice and training, particularly in contexts involving high levels of psychological stress and trauma.