Beyond symptom reduction: Development and validation of the Complementary Measure of Psychotherapy Outcome (COMPO).

Most measures of psychotherapy outcome focus on symptomatic change. However, clients often report other changes through therapy, such as increased self-acceptance. This study reports on the development and validation of the Complementary Measure of Psychotherapy Outcome (COMPO) that assesses different areas of psychological functioning deemed important by clients and therapists. Items were written based on a literature review of client-reported change and feedback from experienced therapists. Exploratory factor analysis was conducted on the initial 42-item COMPO administered to 264 psychotherapy clients. Iterative item reduction resulted in the final 12-item, four-factor solution, with factors named self-acceptance, self-knowledge, relationship quality, and consideration of others. This factor structure, along with a bifactor model that contains a general factor and the four domain-specific factors, was replicated on a sample of 571 adults in the community. The 12-item COMPO exhibits convergent validity with measures of self-esteem, insight, social support, and empathy; demonstrates 2-week test-retest reliability; and predicts life satisfaction. The 12-item COMPO was further administered to 28 clients in short-term psychodynamic therapy for depression. Except for consideration of others, COMPO subscales and total scale scores improved from pre- to posttherapy. Posttherapy COMPO scores were also higher among clients who experienced clinically significant change compared to those who did not. The COMPO was negatively associated with depressive symptoms and impairments in functioning across the three samples. The brevity of the COMPO makes it a convenient tool to supplement symptom-based measures for a more comprehensive assessment of outcome in psychotherapy. (PsycInfo Database Record (c) 2021 APA, all rights reserved).