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Table 3 Demographical and clinical characteristics of influenza A/H1N1 patients, influenza-like illness (ILI) patients, and healthy control subjects

From: Pandemic influenza A/H1N1 virus infection and TNF, LTA, IL1B, IL6, IL8, and CCLpolymorphisms in Mexican population: a case–control study

Characteristic A/H1N1 patients ILI patients Healthy controls p
  (Total: 44) (Total: 50) (Total: 176)  
  n (%) n (%) n (%)  
Sex     
Male 30 (68.18) 29 (58.0) 67 (38.07)  
Female 14 (31.82) 21 (42.0) 109 (61.93)  
Age     
<45 30 (68.18) 30 (60.0) 54 (30.68)  
45-64 11 (25.00) 13 (26.0) 100 (56.82)  
≥65 3 (6.82) 7 (14.0) 22 (12.50)  
BMI ≥30 18 (40.91) 21 (42.0) 46 (26.42)  
Mortality 15 (34.09) 2 (4.0)   <0.001*
P a O 2 <60 mm Hg (severe) 19 (43.18) 24 (48.0)   
ICU 24 (54.55) 15 (30.0)   0.01*
Co-morbidities     
Neurological disease 25 (56.82) 22 (44.0)   
Asthma 2 (4.55) 6 (12.0)   
Cancer 1 (2.27) 2 (4.0)   
Hypertension 8 (18.18) 7 (14.0)   
Smoking 21 (47.73) 29 (58.0)   
Symptomatology     
Fever (>38°C) 33 (75.00) 42 (84.0)   
Cough 23 (52.27) 31 (62.0)   
Nasal Congestion 5 (11.36) 2 (4.0)   
Rhinorrhea 12 (27.27) 20 (40.0)   
Dyspnea 33 (75.00) 35 (70.0)   
  1. *When comparing A/H1N1 patients vs. ILI patients. BMI: Body mass index; PaO2: partial pressure of oxygen in arterial blood; ICU: Intensive Care Unit. Results were considered statistically significant when P was <0.05.