Table 1.
Characteristics of patients with COPD and healthy nonsmokers included in the study.
| COPD | |||
|---|---|---|---|
| Healthy nonsmokers | Moderate | Severe | |
| Subjects (n) | 21 | 52 | 53 |
| Age (years) | 51.3 ± 8.5 | 53.1 ± 5.7 | 57.1 ± 5.1 |
| Smoking pack-years | 0 | 35.4 ± 6.7 | 41.3 ± 5.8 |
| FEV1% pred | 103.2 ± 4.1 | 61.4 ± 5.1 | 39.4 ± 4.1 |
| FEV1/FVC % | 105.3 ± 3.5 | 62.1 ± 3.8 | 48.7 ± 8.1 |
| Inspiratory capacity IC (%) | 109.2 ± 2.3 | 67.6 ± 6.9 | 64.1 ± 7.1 |
Data were presented as mean ± SD. COPD: chronic obstructive pulmonary disease; pack-years: number of cigarette packs per day multiplied by the number of smoking years; FEV1: forced expiratory volume in one second; % pred: % predicted; FVC: forced vital capacity; IC: inspiratory capacity (%).