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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

From: Impact of antiviral treatment and hospital admission delay on risk of death associated with 2009 A/H1N1 pandemic influenza in Mexico

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
  1. a Determined by the linear Chi-square test statistic.