Table 1

Clinical characteristics of healthy smokers and patients with COPD

ParameterSmokersCOPD
Data are mean (SE).
FEV1 =forced expiratory volume in 1 second; FVC=forced vital capacity.
*p<0.05,
**p<0.01,
***p<0.001 compared with equivalent value for smokers.
Age (years)54 (3)68 (2)**
Sex (M:F)11:412:3
Pack years29 (3)37 (4)*
FEV1(l)2.9 (0.2)1.8 (0.1)***
FEV1(% predicted)93 (2)54 (5)***
FEV1:FVC ratio0.84 (0.02)0.53 (0.03)***