Abstract. Objectives: To determine the relative effectiveness of pediatric asthma care among patients treated by a dedicated asthma center (AC) vs children who use the emergency department (ED) as a site of primary asthma care. Methods: A retrospective casecontrol design was used. A random sample of AC cases was selected from a designated comprehensive AC over a 12-month period. Concurrent ED control patients were identified from all cases of pediatric asthma from five urban hospitals based on two or more ED visits. Cases and controls were matched (1:2) based on age and National Heart, Lung, and Blood Institute (NHLBI) asthma severity of illness classification. A telephone survey was administered to the caregivers of all enrolled patients in the study sample. Results: Four elements of pediatric asthma care were examined: quality, access, hospital utilization, and functional impact of disease. Demographic data were similar between the ED cases and the AC controls. In terms of quality of care, the AC patients were more likely to use maintenance antiinflammatory medications, 60.2% vs 22.5% (OR = 5.3; 95% CI = 2.9 to 9.7) and more likely to be taking medications at school, 71.4% vs 48.1% (OR = 2.7; 95% CI = 1.5 to 4.7). In terms of access to care, the AC families were more likely to have a physician to call to assist with outpatient management, 98.2% vs 65.0% (OR = 25.3; 95% CI = 9.0 to 76.9). Frequent ED utilization (Ն1 visit/month) was less likely in the AC patients, 9.2% vs 22.0% (OR = 0.35; 95% CI = 0.16 to 0.79) and school absenteeism was lower as well (9.5 Ϯ 6.7 days vs 16.6 Ϯ 10.3, p < 0.001). Additionally, the caregivers of the AC patients missed fewer workdays (4.7 Ϯ 2.8 vs 7.4 Ϯ 4.1; p = 0.03). Conclusions: Significant disparities in quality, access, resource utilization, and functional impact exist between AC and ED patients. Emergency physicians have a unique opportunity to improve the public health by directing ED patients toward pediatric AC treatment. Key words: pediatrics; asthma; asthma center; emergency department utilization. ACADEMIC EMERGENCY MEDICINE 2001; 8:709-715 A STHMA is currently the most common chronic condition affecting children in the United States and has been the leading cause of childhood disability over the last 25 years. 1 There are approximately 5 million children in the United States diagnosed as having asthma, 2 and the prevalence of pediatric asthma has increased by approximately 50% over the last decade. Asthma accounts for more than 10 million missed school days annually and an estimated loss of more than $1 billion in productivity by working parents of asthmatic children.3 The direct and indirect monetary costs relating to asthma were estimated to be $11.3 billion in 1998. 4 Hospital visits for pediatric asthma have increased significantly. Over the last decade, asthma admission rates for infants 0-4 years old have nearly doubled, and for school-aged children 5-14 years old, the rate of hospital admission has increased nearly 65%.2,4,5 Additionally, emergency departme...