Table 1. Characteristics of all SARI hospitalizations and laboratory-confirmed A/H1N1 influenza hospitalizations, Mexico (December 1, 2011 through March 15, 2012) according to dates of symptom onset.

Variable	SARI hospitalizations	A/H1N1 confirmed hospitalizations
Geography
Central	3527 (46.7)	614 (55.1)
Southern	1329 (17.6)	190 (17)
Other states	2693 (35.7)	311 (27.9)
Demography
Female	3860 (51)	609 (54.6)
Age (years)
0–4	1893 (25)	149 (13.4)
5–14	587 (7.8)	95 (8.5)
15–29	1059 (14)	277 (24.8)
30–44	1108 (14.6)	223 (20)
45–59	1114 (14.7)	218 (19.6)
≥60	1808 (23.9)	153 (13.7)
Inpatient severity
Deaths	443 (5.9)	154 (13.8)