Table 1 Characteristics of laboratory-confirmed A/H1N1 influenza cases by pandemic wave, Mexico, 01 April through 31 December, 2009

Geographic

Central

433/615 (70.4)

602/5741 (10.5)

9948/21081 (47.2)

<0.0001

Southern

58/615 (9.4)

3734/5741 (65)

2322/21081(11)

Other states

124/615 (20.2)

1405/5741 (24.5)

8811/21081 (41.8)

Demography Female

310/612 (50.4)

2922/5690 (51)

10780/21173 (51.2)

0.91

Age (years)

<18

277/611 (45)

3020/5688 (53)

10187/21167 (48)

<0.0001

18–49

283/611 (46)

2410/5688 (42)

9416/21167 (44)

>50

51/611 (8)

258/5688 (5)

1564/21167 (7)

Patients according to severity

Outpatients

456/615 (74.2)

5370/5741 (93.5)

17620/21081 (83.6)

<0.0001

Hospitalizations

131/615 (21.3)

330/5741 (5.7)

2944/21081(14.0)

Deaths

28/615 (4.6)

41/5741 (0.7)

517/21081 (2.4)