Table 3. Age-specific rates (95% CI) of hospitalizations associated with confirmed influenza A per 10,000 residents, 2004–2011.

Year	Proportion of hospitalized children with ≥1 underlying condition	<6 m	6–12 m	<1 y	1–<2 y	2–<5 y	5–<10 y	10–<15 y	15–<18 y
2004	13.5%	25.9	129.7	77.8	95.5	63.5	10.9	2.9	2.4
		(0.7, 144.5)	(42.1, 302.6)	(28.5, 169.3)	(38.4, 196.7)	(35.5, 104.7)	(4.0, 23.7)	(0.4, 10.6)	(0.1, 13.6)
2005	8.1%	129.7	77.8	103.7	40.9	42.3¶	21.8	2.9	4.9
		(42.1, 302.6)	(16.0, 227.3)	(44.8, 204.4)	(8.4, 119.6)	(20.3, 77.8)	(11.3, 38.1)	(0.4, 10.6)	(0.6, 17.6)
2006	25%	0.0	77.8	38.9	54.6	38.1	18.2	1.5	2.4
		(0.0, 95.7)	(16.0, 227.3)	(8.0, 113.7)	(14.9, 139.7)	(17.4, 72.3)	(8.7, 33.4)	(0.0, 8.2)	(0.1, 13.6)
2007	17.5%	51.9	77.8	64.8	68.2	80.4¶	14.5	2.9	2.4
		(6.3, 187.3)	(16.0, 227.3)	(21.0, 151.3)	(22.1, 159.2)	(48.4, 125.5)	(6.3, 28.7)	(0.4, 10.6)	(0.1, 13.6)
2008	11.4%	51.9	77.8	64.8	68.2	76.2	7.3	4.4	0.0
		(6.3, 187.3)	(16.0, 227.3)	(21.0, 151.3)	(22.1, 159.2)	(45.1, 120.4)	(2.0, 18.6)	(0.9, 12.9)	(0.0, 9.0)
2009	16.3%	155.6	155.6	155.6	218.3	122.7	52.7	17.6	14.6
		(57.1, 338.6)	(57.1, 338.6)	(80.4, 271.8)	(124.8, 354.4)	(82.2, 176.2)	(35.3, 75.7)	(9.1, 30.7)	(5.4, 31.8)
2010	7.9%	103.7	0.0	51.9	68.2	84.6	12.7	2.9	0.0
		(28.3, 265.6)	(0.0, 95.7)	(14.1, 132.8)	(22.1, 159.2)	(51.7, 130.7)	(5.1, 26.2)	(0.4, 10.6)	(0.0, 9.0)
2011	22.9%	103.7	77.8	90.8	54.6	59.2	10.9	2.9	4.9
		(28.3, 265.6)	(16.0, 227.3)	(36.5, 187.0)	(14.9, 139.7)	(32.4, 99.4)	(4.0, 23.7)	(0.4. 10.6)	(0.6, 17.6)

^¶No subtype data were available for 2 patients.