Table 1—

Demographic characteristics

SmokersEx-smokers
Males/females n55/1030/6
Age yrs61 (40–77)65 (49–78)
Smoking pack-yrs46±2559±36
Chronic bronchitis n5532
FEV1 L1.55±0.451.58±0.49
FEV1 % pred51±1254±13
FVC L3.09±0.773.01±0.81
FEV1/FVC %51±1153±10
Reversibility# %6.7±5.98.1±5.6
  • Data are presented as median (range) or mean±sd, unless otherwise stated. FEV1: forced expiratory volume in one second; % pred: % predicted; FVC: forced vital capacity. #: salbutamol reversibility as percentage change from pre-bronchodilator FEV1.