Table 1—

Subject characteristics

Subject groupSubjects nSex M:FAge yrsSmoking history pack yrsFEV1 % predFEV1/FVC %FEV1 post β2 % from baseline
Control nonsmokers126:661±120111±1485±5
Control smokers1714:360±739±23107±1582±7
COPD patients1411:364±845±2859±15*56±7*4±4
  • Data are presented as mean±sd unless otherwise stated

  • FEV1: forced expiratory volume in one second

  • FVC: forced vital capacity

  • COPD: chronic obstructive pulmonary disease

  • *p<0.05 compared with control smokers and nonsmokers with normal lung function