Influences of patients' and therapists' interpersonal problems and therapeutic alliance on outcome in psychotherapy

The aim of this study was to investigate the importance of therapists' and patients' interpersonal problems as well as the impact of the therapeutic alliance on symptomatic outcome in psychotherapy. Of interest were direct effects of interpersonal problems, represented through the dimensions of affiliation and control, as well as possible interaction effects between patient and therapist variables on outcome. Further hypotheses referred to therapist differences in the predictive impact of the therapeutic alliance for outcome. Outcome ratings of 1,513 psychotherapy inpatients treated by 31 psychodynamically oriented individual psychotherapists were studied. Therapists' and patients' interpersonal dispositions were assessed with the Inventory of Interpersonal Problems, and patients answered standardized outcome measures before and after therapy and retrospectively evaluated the therapeutic alliance at discharge. The results indicate that dominant patients profited better from their therapy and that therapists' interpersonal disposition did not have a direct influence on outcome. The influence of the therapeutic alliance on outcome varied among the therapists. The general positive effect of therapeutic alliance on outcome was stronger for less affiliative therapists. Limitations of the study and implications of the results are discussed.