Table 1.

Percentage of emergency department (ED) visits with asthma as primary diagnosis by healthcare facility—National Hospital Ambulatory Medical Care Survey, United States, 2010–2015.

	All-cause emergency department (ED) visits			Asthma-related ED visits^a
	Number of visits	Weighted number of visits	SE of weighted number	Number of visits	Weighted number of visits	SE of weighted number	Percent (95% CI)
Total	165,155	134,287,679	3,498,708	2,271	1,770,769	80,155	1.32 (1.22–1.42)
Admitted to this hospital after an ED visit	18,150	13,934,424	487,859	203	155,891	15,797	1.12 (0.92–1.36)
Admitted to a critical care unit	2,238	1,812,453	92,278	29	21,783	4,941	1.20 (0.77–1.86)

Abbreviations: ED, emergency department; SE, standard error; CI, confidence interval.

Primary diagnosis for ED visit was asthma (ICD-9-CM code of 493.0).