Table 2.

Crude incidence rates of pneumonia and influenza-related hospitalizations among short- and long-stay residents in U.S. long-term care facilities, 2013–2015

Days since index date	Short-stay residents (N = 1,118,054)		Long-stay residents (N = 593,443)
	30	90	30	90	180	365
Total person-days observed	24,395,364	32,290,058	15,668,663	41,150,984	70,681,373	111,720,666
Primary diagnosis position on the hospital claim
Number of hospitalizations	6345	8412	5410	11,777	18,202	26,891
Crude IR per 100,000 (95% CI)	26.0 (25.4–26.6)	26.1 (25.5–26.6)	34.5 (33.6–35.4)	28.6 (28.1–29.1)	25.8 (29.4–30.2)	24.1 (23.8–24.4)
Any diagnosis position on the hospital claim
Number of hospitalizations	21,942	28,943	12,819	28,046	43,220	63,560
Crude IR per 100,000 (95% CI)	89.9 (88.8–91.1)	89.6 (88.6–90.7)	81.8 (80.4–83.2)	68.2 (67.3–69.0)	61.1 (60.6–61.7)	56.9 (56.4–57.3)

IR incidence rate, CI confidence interval