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Table 4 Risk factors of ICU admission among patients infected with 2009 pandemic influenza A (H1N1) virus.

From: Clinical features of the initial cases of 2009 pandemic influenza A (H1N1) virus infection in an university hospital of Morocco

Variables Ward ICU P. value*
Age, year (mean ± SD) 14.3 ± 10.8 26.5 ± 19.6 0.030
Male sex, n (%) 94 (56.6) 12 (60) 0.700
Duration of symptoms, days (median (IQR)) 2 (2-4) 4 (2-7) 0.070
Asthma, n (%) 41 (24.6) 6 (30) 0.010
Obesity , n (%) 0 (0) 2 (10) <0.001
Pregnancy, n (%) 12 (7.2) 3 (15) 0.200
Abnormalities on chest radiography, n (%) 34 (20.5) 15 (75%) <0.001
Leukocyte count, per mm3 (mean count ± SD) 8670 ± 1450 13741 ± 1027 0.005
C-reactive protein, mg/liter (mean ± SD) 23.1 ± 16.2 138.6 ± 102.7 <0.001
  1. * P values are from the Chi-squared test, Student's T-test or Mann-Whitney test; IQR, interquartile range; SD, standard deviation.