• Rhonda J Rosychuk, Terry P Klassen, Donald C Voaklander, Ambikaipakan Senthilselvan, and Brian H Rowe.
• Department of Pediatrics, niversity of Alberta, 9423 Aberhart Centre, 11402 University Ave NW, Edmonton, Alberta, Canada T6G 2J3. rhonda.rosychuk@ualberta.ca
• Pediatr Emerg Care. 2011 Apr 1;27(4):256-60.

IntroductionCroup is a common pediatric respiratory illness presenting to the emergency department (ED) in the fall and winter months. Most cases are caused by parainfluenza viruses. We examine the monthly patterns of young children who made croup-related visits to EDs in Alberta, Canada.MethodsEmergency department visits were identified in provincial administrative databases to obtain all ED encounters for croup made by young children (aged ≤2 years) during 6 years (April 1, 1999, to March 30, 2005). Time series models (seasonal autoregressive integrated moving average) were developed to capture temporal and seasonal trends and predict future presentations.ResultsOverall, 27,355 croup-related ED visits were made during the study period. More males (62%) than females presented, and most (43%) were younger than 1 year. Differences were observed in the number of visits made in odd and even years. Peak visits occurred in November for odd years and in February for other years. Strong seasonal patterns at 12 months were detected and included in the modeling.ConclusionsWe observed the presence of a clear biennial pattern of croup ED visits. The seasonal autoregressive moving average models and predictions offer insights into the epidemiology of croup-related visits to EDs and may be helpful in planning both research and resource needs.Copyright © 2011 by Lippincott Williams & Wilkins

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