Table 1– Baseline characteristics of study participants who completed the diagnostic algorithm
On medication#Not on medication#
Subjects n198301
Age yrs48.2±16.342.2±15.6
Females137 (69.2)199 (66.1)
Smokers11 (5.6)27 (9.0)
Baseline FEV1 % pred86.2±18.892.5±15.9
Disease duration yrs19.9±15.517.0±12.9
BMI kg·m−230.2±8.529.3±7.4
Baseline symptoms
 Wheeze61 (30.8)82 (27.2)
 Cough95 (48.0)131 (43.5)
 Shortness of breath76 (38.4)107 (35.5)
 Chest tightness61 (30.8)72 (23.9)
 Sputum production87 (43.9)96 (31.9)
Regular medications
 Leukotriene antagonists25 (12.6)0 (0.0)
 ICS90 (45.5)0 (0.0)
 ICS/LABA106 (53.5)0 (0.0)
  • Data are presented as mean±sd or n (%), unless otherwise indicated. FEV1: forced expiratory volume in 1 s; % pred: % predicted; BMI: body mass index; ICS: inhaled corticosteroid; ICS/LABA: combination ICS and long-acting β-agonist medication. #: regular asthma-controlling medications.