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Table 3 Most common risk factors for pandemic influenza A (H1N1)v in the ICU

From: Intensive care adult patients with severe respiratory failure caused by Influenza A (H1N1)v in Spain

Risk factor Cases (n = 32)
Obesity 10
BMI>40 4
BMI 30 to 40 6
Asthma 5
COPD 4
Pregnancy 2
Heart failure 1
Arterial hypertension 1
Chronic renal failure 1
Diabetes mellitus 1
HIV 1
Neuromuscular disease 1
Hematologic disease 1
None 15
  1. BMI = body mass index; COPD = chronic obstructive pulmonary disease; HIV = positive human immunodeficiency virus.