Table 1—

Subject demographics

COPDSmokersNonsmokers
Subjects12117
Age yrs67±6.957±10.864±15.2
Male/female8/43/82/5
Smoking history pack-yrs55 (13–125)34.8 (23–67)0
FEV1 % predicted70.6±8.882.8 (13.1104 (19
FEV1/FVC%58.9±7.675.7±6.3NA
  • Data are presented as n, mean±sd or mean (range). COPD: chronic obstructive pulmonary disease; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; NA: not available.