Table 1

Clinical characteristics of study subjects

Control Mild asthma Symptomatic asthma Severe asthma
Age (years)30.2 (21–42)27.8 (19–43)27.8 (19–37)49.7 (23–66)
Sex (% males)62675830
FEV1 (% predicted)N/A89.6 (70–114)75.5 (44–112)52.3 (19–79)
  • Control = healthy non-atopic volunteers; mild asthma = patients on β2 agonist only with few symptoms and FEV1>70% predicted; symptomatic asthma = patients on β2agonist only with symptoms on a daily basis over preceding seven days; severe asthma = patients with moderate to severe asthma defined by symptoms and FEV1 on inhaled or oral corticosteroids; FEV1 = forced expiratory volume in one second

  • Results are expressed as mean (range).