Table 1. Background of stable COPD patients.
| Characteristics | ||
| Age | 74.2 | 9.4 |
| Height (cm) | 162.9 | 0.1 |
| Weight (weight) | 53.4 | 6.3 |
| BMI (kg/m2) | 20.1 | 2.0 |
| Blood gas data | ||
| PaO2 at rest (mmHg) | 76.9 | 12.8 |
| PaCO2 at rest (mmHg) | 44.2 | 4.7 |
| Pulmonary fuction | ||
| FEV1 (L) | 1.21 | 0.61 |
| %FEV1(%) | 44.19 | 20.91 |
| FVC (L) | 2.42 | 0.84 |
| %FVC (%) | 73.98 | 26.32 |
| FEV1/FVC | 44.91 | 12.93 |
| GOLD stage | ||
| Stage 1 | 1 | |
| Stage 2 | 2 | |
| Stage 3 | 8 | |
| Stage 4 | 3 | |
Data are presented as mean ± SD. BMI: Body Mass Index; FVC: Forced vital capacity; FEV1: forced expiratory volume in 1 second. The staging of the disease was divided into stages I to IV based on the GOLD criteria.