• Meredith A Goodwin, Kurt C Stange, Stephen J Zyzanski, Benjamin F Crabtree, Elaine A Borawski, and Susan A Flocke.
• Department of Family Medicine and Community Health, Case Western Reserve University, Cleveland, Ohio, USA.
• J Eval Clin Pract. 2017 Dec 1; 23 (6): 1322-1328.

Rationale, Aims, And ObjectivesThis study examines the degree to which a "Hawthorne effect" alters outpatient-visit content.MethodsTrained research nurses directly observed 4454 visits to 138 family physicians. Multiple data sources were used to examine the Hawthorne effect including differences in medical record documentation for observed visits and the prior visit by the same patient, time use during visits on the first versus the second observation day of each physician, and report by the patient, physician, and observer of the effect of observation.ResultsVisits on the first versus the second observation day were longer by an average of 1 minute (P < .001); there were time-use differences for 4 of 20 behaviour categories evaluated. No effect of the observer on the interaction was reported by 74% of patients and 55% of physicians. Most of those that reported an affect indicated it was slight. Patients with non-White race, lower-educational level, and poorer health were more likely to report being affected by the observer.ConclusionsIn a study that was designed to minimize the Hawthorne effect, the presence of an observer had little effect on most patient-physician visits but appeared to at least slightly effect a subgroup of vulnerable patients.© 2017 John Wiley & Sons, Ltd.

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