Table 1.
Demographic information and clinical characteristics.
| Variable | Control (n = 150) | COPD (n = 150) | P |
|---|---|---|---|
| Age (years) | 67.9 ± 0.94 | 72.8 ± 0.61 | 0.132 |
| Female, n (%) | 51 (34.0) | 38 (25.3) | 0.100 |
| Emphysema | N.A. | 121 (80.7) | N.A. |
| Smoking status | <0.001 | ||
| Never-smoker, n (%) | 55 (36.7) | 8 (5.3) | |
| Former-smoker, n (%) | 65 (43.3) | 123 (82.0) | |
| Current-smoker, n (%) | 30 (20.0) | 19 (12.7) | |
| WBC (109/L) | 6.22 ± 0.121 | 7.45 ± 0.278 | <0.01 |
| Neutrophil (109/L) | 3.24 ± 0.077 | 5.40 ± 0.270 | <0.01 |
| Lymphocyte (109/L) | 1.83 ± 0.071 | 1.26 ± 0.047 | <0.01 |
| Eosinophil (109/L) | 0.12 ± 0.010 | 0.18 ± 0.024 | 0.001 |
| Monocyte (109/L) | 0.41 ± 0.056 | 0.57 ± 0.033 | <0.01 |
| Basophil (109/L) | 0.02 ± 0.002 | 0.03 ± 0.003 | 0.009 |
| FEV1 (%) | N.A. | 52.02 ± 2.659 | N.A. |
| FEV1/FVC (%) | N.A. | 57.79 ± 1.537 | N.A. |
| FEV1 (L) | N.A. | 1.16 ± 0.066 | N.A. |
| FVC (L) | N.A. | 1.88 ± 0.064 | N.A. |
| PH | N.A. | 7.39 ± 0.007 | N.A. |
| PCO2 (mmHg) | N.A. | 51.99 ± 2.107 | N.A. |
| PO2 (mmHg) | N.A. | 70.88 ± 2.588 | N.A. |
| RV%TLC-SB (%) | N.A. | 54.59 ± 1.564 | N.A. |
| DLCO SB (mmol/min/kPa) | N.A. | 3.82 ± 0.259 | N.A. |
WBC, White blood cell; FEV1, Forced expiratory volume in one second; FVC, Forced vital capacity; N.A., Not available.