Table 1. Characteristics of Hospitalizations and ED Visits of Patients by Type of Respiratory Infection.

	Influenza				Culture-Negative Pneumonia
	Hospitalizations (N = 14 764)		Emergency Department Visits (N = 57 522)		Hospitalizations (N = 274 226)		Emergency Department Visits (N = 113 997)
	n	%	n	%	n	%	n	%
Gender
male	6335	43	22 828	40	128 888	47	54 471	48
female	8429	57	34 692	60	145 337	53	59 520	52
Age
years: mean (st. deviation)	65(20)		38(16)		69(18)		49(19)
18–39	1880	13	34 606	60	20 266	7	38 213	34
40–49	1370	9	9969	17	22 078	8	21 596	19
50–59	2044	14	7106	12	35 343	13	21 243	19
60–69	2292	16	3265	6	43 166	16	14 283	13
70–79	2695	18	1509	3	55 847	20	9 486	8
≥80	4483	30	1067	2	97 526	36	9176	8
Race
white	7304	49	18 772	33	146 914	54	49 596	44
black	3202	22	20 199	35	62 154	23	34 214	30
native American/Alaskan	56	0	261	0	1384	1	531	0
Asian	259	2	1315	2	8904	3	2666	2
native Hawaiian	1	0	20	0	122	0	50	0
Ethnicity
hispanic	1456	10	9497	17	32 375	12	14 348	13
Year
2005	585	4	1998	3	31 211	11	7620	7
2006	306	2	1459	3	29 202	11	7884	7
2007	175	1	1534	3	27 504	10	8029	7
2008	528	4	3363	6	25 359	9	8410	7
2009	1594	11	12 116	21	24 373	9	9911	9
2010	561	4	2552	4	22 378	8	8290	7
2011	871	6	3317	6	22 792	8	9970	9
2012	855	6	3250	6	21 419	8	10 845	10
2013	1901	13	7837	14	19 682	7	10 284	9
2014	2489	17	7490	13	17 464	6	10 014	9
2015	2179	15	4639	8	16 771	6	11 115	10
2016	2720	18	7967	14	16 071	6	11 625	10
Season
fall	989	7	7930	14	61 704	23	27 948	25
spring	4379	30	15 913	28	72 750	27	28 665	25
summer	647	4	3953	7	59 291	22	22 845	20
winter	8749	59	29 726	52	80 481	29	34 539	30