Table 1.
Baseline characteristics of the study subjects with COPD
| Variable | n | % | |
|---|---|---|---|
| Gender | Male | 47 | 94.0 |
| Female | 3 | 6.0 | |
| Age | 40-59 years old | 16 | 32.0 |
| ≥ 60 years old | 34 | 68.0 | |
| Smoking status | Mild | 1 | 2.0 |
| Moderate | 8 | 16.0 | |
| Severe | 41 | 82.0 | |
| Serum TNF-α concentrationa | Tertile 1 | 12 | 24.0 |
| Tertile 2 | 17 | 34.0 | |
| Tertile 3 | 21 | 42.0 | |
| Vitamin D Levelb | Tertile 1 | 20 | 40.0 |
| Tertile 2 | 15 | 30.0 | |
| Tertile 3 | 15 | 30.0 | |
| Severity of COPD | A | 5 | 10.0 |
| B | 18 | 36.0 | |
| C | 8 | 16.0 | |
| D | 19 | 38.0 | |
a
Tertile 1 (0. 00-0.06 pg/dl); Tertile 2 (0.07-0.20 pg/dl); Tertil 3 (0.21-1.83 pg/dl);
b
Tertile 1 (182. 1-364.5 pg/mL); Tertile 2 (364.7-630.7 pg/mL); Tertile 3 (632.6-3707.2 pg/mL).