Table 2—

Subject characteristics

ControlsAsthma cases
NonfatalFatal
Subjects n6937107
Age yrs35 (13–90)27 (12–69)35 (10–76)
Sex#
 Male46 (67)20 (54)47 (44)
 Female23 (33)17 (46)60 (56)
Smoking status
 Ever12 (33)14 (54)15 (40)
 Never24 (67)12 (46)22 (60)
Asthma severity***
 Mild/moderate18 (64)4 (14)
 Severe10 (36)25 (86)
Asthma duration yrs16 (10–26)18 (7–27.5)+
Age at asthma onset yrs9 (2–20)12.5 (5–26.8)+
  • Data are presented as median (interquartile range) or n (%), unless otherwise stated. Data for age are presented as median (range). ***: p<0.001 for group effect; #: p = 0.013 (Chi-squared test). : n = 25; +: n = 44.