Table 1—

Baseline patient characteristics by asthma severity grade

TotalIntermittentMild persistentModerate persistentSevere persistent
Patients n (%)500174 (34.8)134 (26.8)153 (30.6)39 (7.8)
Age yrs36.6±10.734.2±10.7*36.0±9.8*,#38.5±10.5#42.0±11.6
Females %57.256.353.756.974.4
Comorbid conditions %69.675.371.663.461.5
 Rhinitis57.064.9+59.7+51.0+35.9+
 Sinusitis21.218.420.224.225.6
 Nasal polyps/aspirin intolerance13.09.814.214.418.0
FEV1§ % pred91±1587±1776±1957±20
  • Data are presented as mean±sd unless otherwise indicated

  • FEV1: forced expiratory volume in one second

  • % pred: per cent predicted

  • §: data available for 314 of the 500 patients

  • *, #, : p<0.05 versus differently labelled severity groups (analysis of variance with post hoc comparisons between severity groups)

  • +: p<0.05 overall association between severity and the patient characteristic (Chi-squared test for homogeneity)