Academic emergency medicine : official journal of the Society for Academic Emergency Medicine
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The lack of valid classification methods for emergency department (ED) visit urgency has resulted in large variation in reported rates of nonurgent ED utilization. ⋯ The explicit criteria and resources methods best approximate implicit criteria in classifying ED visit urgency in infants younger than six months of age. If confirmed in further studies, resources utilized has the potential to be an inexpensive, easily applicable method for urgency classification of infant ED visits when limited data are available.