Table 1. Baseline characteristics.
| Variables | Value (n=49) |
|---|---|
| Age, years | 72 [63–76] |
| Sex, male | 49 (100.0) |
| Body mass index, kg/m2 | 21.1 (19.1–24.1) |
| Height, cm | 164 [159–170] |
| Smoking history | |
| Former smoker | 40 (81.6) |
| Current smoker | 9 (18.4) |
| Laboratory findings | |
| White blood cell, /µL | 8,790 (7,255–12,765) |
| C-reactive protein, mg/dL | 0.44 (0.29–1.62) |
| Albumin, g/dL | 4.1 (3.8–4.4) |
| Partial pressure of carbon dioxide, mmHg | 33 [29–42 |
| Observation period, months | 24 [14–41] |
| Type of emphysema on computed tomography | |
| Centrilobular | 23 (46.9) |
| Paraseptal | 12 (24.5) |
| Combined centrilobular and paraseptal | 14 (28.6) |
Data are presented as number (%) or the median (interquartile range).