Witold Simon, Michael J. Lambert, Gregory Busath, Aaron Vazquez, Arjan Berkeljon, Kevin Hyer, Mac Granley & Michael Berrett
Psychotherapy Research, (2013). 23 (3), 287-300.

Abstract. Research on the effects of progress feedback and clinician problem-solving tools on patient outcome has been limited to a few clinical problems and settings (Shimokawa, Lambert, & Smart, 2010). Although these interventions work well in outpatient settings their effects so far have not been investigated with eating-disordered patients or in inpatient care. In this study, the effect of providing feedback interventions was investigated in a randomized clinical trial involving 133 females diagnosed with anorexia nervosa, bulimia nervosa, or eating disorders not otherwise specified. Comparisons were made between the outcomes of patients randomly assigned to either treatment-as-usual (TAU) or an experimental condition (Fb) within therapists (the same therapists provided both treatments). Patients in the Fb condition more frequently experienced clinically significant change than those who had TAU (52.95% vs. 28.6%). Similar trends were noted within diagnostic groups. In terms of pre to post change in mental health functioning, large effect sizes favored Fb over TAU. Patients’ BMI improved substantially in both TAU and the feedback condition. The effects of feedback were consistent with past research on these approaches although the effect size was smaller in this study. Suggestions for further research are delineated.