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1 Institute for Clinical Evaluative Sciences in Ontario, Sunnybrook Health Science Centre, North York, Ontario; Department of Preventive Medicine and Biostatistics, University of Toronto
2 Paediatric Outcomes Research Team, Division of General Paediatrics, Hospital for Sick Children, Toronto, Ontario, Canada
3 Department of Preventive Medicine and Biostatistics, University of Toronto; Paediatric Outcomes Research Team, Division of General Paediatrics, Hospital for Sick Children, Toronto, Ontario, Canada
4 Institute for Clinical Evaluative Sciences in Ontario, Sunnybrook Health Science Centre, North York, Ontario
Background. Admissions to hospitals for childhood asthma seem to be increasing, even though admissions for other childhood conditions are decreasing. We studied admissions and readmissions for childhood asthma in Ontario in an attempt to uncover factors relating to the admission patterns.
Methods. Using the hospital discharge data from the Canadian Institute for Health Information, 28 646 children with diagnoses of asthma were identified from April 1, 1989, to March 31, 1992.
Results. The admission rates for asthma among children in Ontario showed a 14.8% decrease from 1987 to 1992. This decline was observed primarily in 5- to 17-year-olds. Younger children had a fourfold risk of hospital admission for asthma. In the 4 years studied, 10 427 children (36.4%) were readmitted at least once, representing 22 114 readmissions, 16 196 (73.2%) of which were for asthma. The 6-month probabilities of readmission for asthma were 20.0% (0- to 4-year-olds) and 11.7% (5- to 17-year-olds). The estimated relative risks (RRs) indicated that younger children had a significantly higher risk of readmission for asthma (RR, 1.38;95% confidence interval, 1.30 to 1.46) or asthma-related causes (RR, 5.02; 95% confidence interval, 4.16 to 6.05).
Conclusions. The observed increasing trend in admissions for asthma among children in the 1970s and 1980s leveled off in the early 1990s. The declining admission rates were largely caused by the lower admission rates among school-aged children from 5 to 17 years. The relatively high admission and readmission rates of preschool children are still a concern. Further research is necessary to examine factors that influence admissions for asthma among young children.
Submitted on June 13, 1995
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