Interpersonal clarification effects in Cognitive-Behavioral Therapy for depression and how they are moderated by the therapeutic alliance

Background: Although a wide body of research links depression to interpersonal deficits, Cognitive-Behavioral Therapy (CBT), considered the gold standard in the treatment of this condition, has not been developed to specifically address interpersonal difficulties. However, cognitive changes on a relational level occurring during CBT might play an important role in the treatment of depression. Interpersonal clarification refers to the process of better understanding the nature of one's interpersonal patterns during therapy. The aim of this study is to analyze the effects of interpersonal clarification in CBT and how they are moderated by the therapeutic alliance. Methods: A sample of 621 patients diagnosed with depression were treated with CBT by 126 therapists in a university outpatient clinic. Patients completed measures of interpersonal problems and depression severity at baseline, measures of symptomatic evolution before each session and process measures (assessing interpersonal clarification and alliance) after each session. Multilevel models separating between-patient (BP) and within-patient (WP) effects of interpersonal clarification, and including BP and WP alliance effects as covariates and moderators of the interpersonal clarification effects were conducted. Results: Analyses showed both significant BP and WP effects interpersonal clarification, even when adjusting for alliance effects. Furthermore, significant interactive effects were found between outcome of WP interpersonal clarification with both BP alliance and WP alliance. Limitations: Interpersonal clarification was measured with one single-item and adherence to CBT was not explicitly measured. Conclusions: The results present preliminary evidence for considering interpersonal clarification a meaningful change process in CBT for depression, especially in the context of a stronger therapeutic alliance.