Table 5 Case fatality ratios (mean and 95% CIs) among laboratory-confirmed A/H1N1 inpatients according to admission delay, Mexico, 01 April through 31 December, 2009
Variable | Overall case fatality ratio | Admission delay | P valuea | |
|---|---|---|---|---|
<=2 days | >2 days | |||
Total A/H1N1 deaths (% of total A/H1N1 cases) | 14.4% (13.3,15.6) | 8.0% (6.9,9.17) | 23.3% (21.2,25.4) | P < 0.0001 |
Geographic | ||||
Central | 14.9% (13.3,16.6) | 7.9% (6.37,9.7) | 23.9% (21,26.9) | P < 0.0001 |
Southern | 7.2% (5.3,9.6) | 4.0% (2.3,6.4) | 13.5% (9.14,18.9) | P < 0.0001 |
Other states | 16.9% (14.9,19) | 10.1% (8.0,12.4) | 26% (22.5,29.7) | P < 0.0001 |
Pandemic wave | ||||
Spring | 15.9% (10.3,22.8) | 5.5% (1.5,13.4) | 26.4% (16.7,38.1) | P = 0.001 |
Summer | 10.4% (7.47,14) | 5.8% (3.1,9.8) | 17.6% (11.7,24.9) | P < 0.0001 |
Fall | 14.8% (13.6,16) | 8.3% (7.1,9.6) | 23.7% (21.5,26) | P < 0.0001 |
Demography | ||||
Female | 12.5% (11.2,14) | 7.4% (6.1,9.0) | 19.9% (17.3,22.7) | P < 0.0001 |
Male | 16.9% (15.1,18.8) | 8.7% (7.0,10.7) | 27.5% (24.2,30.9) | P < 0.0001 |
Age (years) | ||||
<18 | 6.3% (5,7.8) | 3.4% (2.2,4.9) | 11.8% (8.9,15.3) | P < 0.0001 |
18–49 | 16.6% (15,18.4) | 8.4% (6.9,10.2) | 27.3% (24.3,30.4) | P < 0.0001 |
>50 | 23% (19.8,26.5) | 17.9% (13.8,22.7) | 27.7% (23,32.9) | P = 0.003 |