Table 1. Characteristics of the Recruited Subjects.
| Groups | Nonsmoker (n = 24) | Smoker (n = 30) | COPD (n = 27) |
|---|---|---|---|
| Age (years) | 62.14 ± 4.26 | 59.23 ± 5.81 | 62.19 ± 5.31 |
| Smoking (packets-years) | 0 | 38.28 ± 10.97* | 45.88 ± 11.23* |
| BMI (kg/m2) | 21.94 ± 3.57 | 20.86 ± 3.23 | 20.11 ± 3.62 |
| FEV1% predicted | 98.21 ± 7.59 | 94.39 ± 9.51 | 74.59 ± 10.83* |
| FEV1/FVC% | 79.65 ± 6.34 | 82.81 ± 5.95 | 61.65 ± 6.39* |
| PaO2 (mmHg) | 92.11 ± 7.29 | 87.61 ± 8.35 | 82.93 ± 8.02 |
Abbreviations: BMI = body mass index; FEV1 = forced expiratory volume in 1 second; PaO2 = arterial partial pressure of oxygen. *P < 0.05 versus nonsmoker group.