Table 1– Subject characteristics
COPDCOPD and asthmap-value
Subjects n3120450
Age years64.0±8.460.0±8.7<0.001
Females1335 (42.8)252 (56)<0.001
African–American627 (20.1)167 (37.1)<0.001
BMI kg·m−227.9±6.128.8±6.90.006
FEV1 L1.45±0.631.40±0.620.16
FEV1 % predicted50.3±18.050.3±17.90.95
Bronchodilator responsiveness1120 (36.13)177 (39.42)0.19
Absolute BDR L0.09±0.160.11±0.160.11
  • Data are presented as mean±sd or n (%), unless otherwise stated. COPD: chronic obstructive pulmonary disease; BMI: body mass index; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; BDR: bronchodilator response (>200 mL and 12% change in FEV1).