TABLE 1

Demographics and baseline characteristics

Study 1Study 2
Subjects3630
Sex
 Male1917
 Female1713
Age years61.3±5.262.0±7.0
BMI kg·m−225.7±3.126.4±3.6
FEV1 % pred50.4±12.250.8±10.4
FEV1 L1.44±0.51.52±0.7
Bronchodilator reversibility %17.4±11.1#19.5±8.6
Smoking status
 Current smoker2410
 Ex-smoker1220
Cigarette pack-years47.1±19.338.6±17.2

Data are presented as n or mean±sd. BMI: body mass index; FEV1: forced expiratory volume in 1 s. Pre-bronchodilator values shown. #: 30 min post-salbutamol and ipratropium; : 30 min post-salbutamol.