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Table 2 Characteristics of laboratory-confirmed A/H1N1 influenza 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 Time from symptoms onset to admission P valuea
Days from symptoms onset to admission Group 1 < =2 days Group 2 > 2 days  
No. of patients (% of all study inpatients) 2223 (58%) 1610 (42%) P < 0.0001
Disease outcome
Deaths, No. (%) 177(8%) 375 (23.3%) P < 0.0001
Pandemic wave
Spring wave 73 (50.3%) 72 (49.7%) P = 0.085
Summer wave 223 (61.1%) 142 (38.9%)  
Fall wave 1927 (58.0%) 1396 (42.0%)  
Gender
Females, No. (%) 1293 (58.2%) 889 (55.2%) P = 0.07
Age group (y), No. (% in each group)
< 18 800 (65.4%) 424 (34.6%) P < 0.0001
18–49 1114 (56.5%) 857 (43.5%)  
>50 307 (48.3%) 328 (51.7%)  
Spring wave 31 (44.3%) 39 (55.7%) P = 0.003
Summer wave 114 (64.4%) 63 (35.6%)  
Fall wave 197 (65.7%) 103 (34.3%)  
  1. a Chi-square test.