• Samuel Vaillancourt, John D Cullen, Katie N Dainty, Taucha Inrig, Andreas Laupacis, Denise Linton, Stéphanie Malherbe, Alies Maybee, Michael J Schull, M Bianca Seaton, and Dorcas E Beaton.
• Department of Emergency Medicine, St. Michael's Hospital, Toronto, Canada; Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada. Electronic address: sam.vaillancourt@utoronto.ca.
• Ann Emerg Med. 2020 Aug 1; 76 (2): 219-229.

Study ObjectiveCommon outcomes of care valued by emergency department (ED) patients who are not hospitalized have been characterized, but no measurement instrument has been developed to date. We developed and validated a patient-reported outcome measure for use with adult ED patients who are discharged home (PROM-ED).MethodsIn previous research, 4 main outcomes of importance to ED patients were defined: symptom relief, understanding, reassurance, and having a plan. We developed a bank of potential questions (phase 1) that were first tested for suitability through cognitive debriefing with patients (phase 2). Revised questions were then tested quantitatively with a large panel of participants who had recently received ED care (phase 3). Informed by these results, a panel of experts used a modified Delphi process to make decisions on item reduction. The resulting instrument (PROM-ED 1.0) was then evaluated for its measurement properties (structural validity, hypothesis testing, and reliability).ResultsSixty-seven questions divided among 4 scales (1 for each outcome domain) were assembled. In accordance with cognitive debriefing with 8 patients (phase 2), 15 questions were modified and 13 removed. Testing of these questions with 444 participants (phase 3) identified problematic floor or ceiling effects (n=10), excessive correlations between items (n=11), and low item-total correlations (n=7). The expert panel (22 participants, phase 4) made decisions using this information on the exclusion of items, resulting in 22 questions across 4 scales that together constitute the PROM-ED 1.0. Testing provided good evidence of validity and test-retest reliability (n=200).ConclusionThe PROM-ED enables the measurement of patient-centered outcomes of importance to patients receiving care in the ED who are not hospitalized. These data could have important applications in research and care improvement.Copyright © 2019 American College of Emergency Physicians. Published by Elsevier Inc. All rights reserved.

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