Table 1—

Subject characteristics

Subjects group	Subjects n	Age yrs	Smoking history pack-yrs	FEV₁ % pred	FEV₁/FVC %	Male/female n	Height cm	Weight kg
Control nonsmokers	19	64±10		93±21	79±7	11/8	170±9	81±14
Asymptomatic smokers	20	62±8	27±14	90±17	74±5	18/2	173±6	74±12
Moderate COPD patients	20	64±6	30±15	54±8*	60±7*	16/4	176±5	78±15

Data are presented as mean±sd, unless otherwise stated. FEV₁: forced expiratory volume in one second; % pred: % predicted; FVC: forced vital capacity. *: p<0.05 compared with control smokers and nonsmokers with normal lung function.