Academic emergency medicine : official journal of the Society for Academic Emergency Medicine
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The primary study aim was to examine the variations in crowding when an emergency department (ED) initiates ambulance diversion. ⋯ There was marked variation in ED workload rates and whether or not ambulance diversion occurred during a 24-hour period. This variability in initiating ambulance diversion suggests different or inconsistently applied decision-making criteria for initiating diversion.