Table 2.

Adjusted Incremental Health-Care Utilization Rates per Person per Year by Severity of Asthma, 2010–2017†

	Asthma (n = 13,732) vs No Asthma (n = 160 805)	Mild Asthma (n = 10,586) vs No Asthma	Moderate Asthma (n = 3048) vs No Asthma	Severe Asthma (n = 98) vs No Asthma	Moderate Asthma vs Mild Asthma	Severe Asthma vs Mild Asthma
Outpatient visits	2.84 (2.76, 2.92)*	2.53 (2.43, 2.62)*	3.67 (3.52, 3.83)*	6.72 (6.08, 7.35)*	1.41 (1.22, 1.61)*	5.31 (4.55, 6.08)*
ED visits	0.14 (0.13, 0.16)*	0.13 (0.12, 0.15)*	0.17 (0.14, 0.20)*	0.28 (0.10, 0.46)*	0.07 (0.03, 0.11)*	0.22 (−0.01, 0.45)
Hospitalizations	0.04 (0.04, 0.05)*	0.03 (0.02, 0.04)*	0.08 (0.06, 0.09)*	0.09 (−0.02, 0.19)	0.05 (0.02, 0.08)*	0.06 (−0.07, 0.19)
Days of hospital stay	0.71 (0.57, 0.85)*	0.87 (0.71, 1.04)*	0.16 (−0.08, 0.39)	5.81 (4.29, 7.33)*	−0.68 (−0.99, −0.37)*	5.55 (3.85, 7.25)*

Notes: †Data are presented as mean (95% CI). Zero-inflate Poisson regression was used to adjust for age, sex, race, ethnicity, region, income, insurance, smoking, and Charlson Comorbidity Index. *P < 0.05.

Abbreviations: ED, emergency department, CI, confidence interval.