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Table 1 Characteristics of laboratory-confirmed A/H1N1 influenza cases by pandemic wave, 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 Pandemic wave  
  Wave 1 Wave 2 Wave 3 P valuea
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)  
  1. Wave 1 (spring) refers to April 1 through May 20; wave 2(summer) refers to May 21 through August 1; wave 3 (fall) refers to August 2 through December 31 of 2009. Data are percentages of cases unless otherwise specified.
  2. a Determined by the Chi-square test statistic.