Background: There are limited data that examine differences in asthma etiology between black and white children with severe or difficult-to-treat asthma.
Objective: To describe demographic, clinical, and asthma-related outcomes in black and white children and examine whether differences in outcomes are explained by confounding factors in sequential multivariable models.
Methods: Black (n = 86) and white (n = 262) children aged 6-11 years from The Epidemiology and Natural History of Asthma: Outcomes and Treatment Regimens 3-year observational study were analyzed. Baseline demographics and clinical characteristics were described for both cohorts, and outcomes at month 12 were analyzed using statistical models, sequentially adjusting for potential confounders.
Results: Black children were more likely to be male (79.1% vs 66.4%; P < .05), obese (12.8% vs 1.5%; P < .001), and from a lower income stratum (USD43,400 vs 55,770; P < .001) than white children. Black children had higher geometric mean IgE levels (434.8 vs 136.8 IU/mL; P < .001), were more likely to have very poorly controlled asthma (72.1% vs 53.4%), use long-term systemic corticosteroids (30.2% vs 9.2%; P < .001), have poorer quality of life (5.5 vs 6.1; P < .001), and have an emergency department visit (27.4% vs 7.7%, P < .001) in the 3 months before month 12. Differences in asthma control and the severity of exacerbations persisted even after accounting for all confounding factors.
Conclusions: Among children with severe or difficult-to-treat asthma, asthma burden is greater in black than white children particularly related to several clinical and patient-reported outcome measures that are not explained by differences in background or clinical characteristics.
Keywords: Asthma-related quality of life; Difficult-to-treat asthma; Exacerbations; Patient-reported outcomes; Pediatric asthma; Racial disparities; Severe asthma.
Copyright © 2018. Published by Elsevier Inc.