Table 2.
Baseline Characteristics of Participants
| Characteristic | Control | COPD |
|---|---|---|
| Number (male/female) | 10 (2/8) | 15 (12/3) |
| Age | 47.20 ± 4.49 | 73.20 ± 2.12 |
| Body mass index (kg/m2) | 21.44 ± 1.17 | 26.40 ± 1.17 |
| Smoking history | 0 | 12 |
| Smoking index (SI) | ||
| SI = 0 | 10 | 3 |
| 400 ≤ SI ≤ 500 | N/A | 3 |
| 800 ≤ SI ≤ 900 | N/A | 5 |
| 1,000 ≤ SI | N/A | 4 |
| Comorbidities | ||
| Allergic rhinitis | 0 | 2 |
| Blood routine examination (109/L) | ||
| Leukocytes | 5.48 ± 0.36 | 6.38 ± 0.34 |
| Neutrophils | 3.52 ± 0.26 | 4.19 ± 0.32 |
| Eosinophils | 0.20 ± 0.07 | 0.18 ± 0.03 |
| Pulmonary function | ||
| FEV1 (%) | N/A | 72.30 ± 3.38 |
| FEV1/FVC (%) | N/A | 68.86 ± 2.55 |
Note: Smoking index, cigarettes smoked per day × years of smoking.