Table 3 Rates of antiviral administration (mean and 95% confidence intervals) among laboratory-confirmed A/H1N1 influenza cases by pandemic wave, Mexico, 01 April through 31 December, 2009

No. patients that received antivirals (% of total A/H1N1 cases)

19.3% (18.8, 19.7)

48.6% (44.6,52.6)

54.9% (53.6,56.2)

8.7% (8.32,9.09)

P < 0.0001

Geographic

Central

12.1% (11.5,12.7)

41.6% (36.9,46.4)

38.5% (34.6,42.6)

9.19% (8.63,9.78)

P < 0.0001

Southern

39.1% (37.9,40.4)

65.5% (51.9,77.5)

59.8% (58.3,61.4)

5.13% (4.27,6.11)

P < 0.0001

Other states

15.2% (14.5,15.9)

65.3% (56.3,73.6)

48.8% (46.2,51.5)

9.08% (8.48,9.7)

P < 0.0001

Female

19.4% (18.8,20.1)

47.7% (42.1,53.5)

53.8% (52,55.6)

9.33% (8.79,9.9)

P < 0.0001

Male

19% (18.4,19.7)

49.5% (43.8,55.3)

56.1% (54.2,57.9)

8.03% (7.51,8.57)

P < 0.0001

Age (years)

<18

19.5% (18.9,20.2)

50.2% (44.2,56.2)

58.2% (56.5,60)

7.09% (6.59,7.6)

P < 0.0001

18–49

19.8% (19.1,20.5)

48.2% (42.3,54.2)

52.4% (50.4,54.4)

10.4% (9.79,11)

P < 0.0001

>50

14.2% (12.7,15.9)

43.1% (29.3,57.8)

40% (34,46.2)

8.99% (7.61,10.5)

P < 0.0001

Patients according to severity

Outpatients

20.1% (19.6,20.7)

48.7% (44,53.4)

55.4% (54,56.7)

8.67% (8.25,9.09)

P < 0.0001

Inpatients

14.6% (13.4,15.8)

46.6% (37.8,55.5)

49.4% (43.9,54.9)

9.29% (8.26,10.4)

P < 0.0001

Deaths

11.1% (8.68,13.9)

57.1% (37.2,75.5)

39% (24.2,55.5)

6.4% (4.44,8.86)

P < 0.0001