• John M Kelley, Gordon Kraft-Todd, Lidia Schapira, Joe Kossowsky, and Helen Riess.
• Empathy and Relational Science Program, Psychiatry Department, Massachusetts General Hospital/Harvard Medical School, Boston, Massachusetts, United States of America; Psychology Department, Endicott College, Beverly, Massachusetts, United States of America.
• Plos One. 2014 Jan 1;9(4):e94207.

ObjectiveTo determine whether the patient-clinician relationship has a beneficial effect on either objective or validated subjective healthcare outcomes.DesignSystematic review and meta-analysis.Data SourcesElectronic databases EMBASE and MEDLINE and the reference sections of previous reviews.Eligibility Criteria For Selecting StudiesIncluded studies were randomized controlled trials (RCTs) in adult patients in which the patient-clinician relationship was systematically manipulated and healthcare outcomes were either objective (e.g., blood pressure) or validated subjective measures (e.g., pain scores). Studies were excluded if the encounter was a routine physical, or a mental health or substance abuse visit; if the outcome was an intermediate outcome such as patient satisfaction or adherence to treatment; if the patient-clinician relationship was manipulated solely by intervening with patients; or if the duration of the clinical encounter was unequal across conditions.ResultsThirteen RCTs met eligibility criteria. Observed effect sizes for the individual studies ranged from d = -.23 to .66. Using a random-effects model, the estimate of the overall effect size was small (d = .11), but statistically significant (p = .02).ConclusionsThis systematic review and meta-analysis of RCTs suggests that the patient-clinician relationship has a small, but statistically significant effect on healthcare outcomes. Given that relatively few RCTs met our eligibility criteria, and that the majority of these trials were not specifically designed to test the effect of the patient-clinician relationship on healthcare outcomes, we conclude with a call for more research on this important topic.

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