Table 1 Baseline characteristics of COPD group and non-COPD group
Characteristics | COPD | Non-COPD | P-value | ||
|---|---|---|---|---|---|
| Â | (n=438) | Total (n=99) | Ever smoker (n=46) | Never smoker (n=53) | Â |
Age (year) | 69.0 ± 7.6 | 60.5 ± 4.8 | 61.4 ± 4.9 | 59.8 ± 4.6 | p < 0.001 |
Sex (male) | 394 (90.2%) | 56 (56.6%) | 44 (95.7%) | 12 (22.6%) | p < 0.001 |
Pack-year | 39.0 [24.0;50.0] | 0.0 [0.0;17.9] | 20.0 [10.0;34.5] | 0.0 [0.0; 0.0] | p < 0.001 |
 Current smoker | 107 (24.4%) | 8 (8.1%) |  |  | p < 0.001 |
 Former smoker | 278 (63.5%) | 38 (38.4%) |  |  | p < 0.001 |
 Never smoker | 46 (10.5%) | 53 (53.5%) |  |  | p < 0.001 |
 Unknown | 7 (1.6%) |  |  |  |  |
Pre-bronchodilator FEV1(% predicted) | 65.0 [51.0;77.0] | 102.0 [93.5;111.0] | 101.0 [94.0;111.0] | 104.0 [93.0;111.0] | p < 0.001 |
Post-bronchodilator FEV1(% predicted) | 68.0 [54.0;80.0] | Â | Â | Â | Â |
Exacerbation history in past year | 57.0 (13.0%) | Â | Â | Â | Â |
mMRC | 1.14±0.82 |  |  |  |  |
6MWD (meter) | 439.0 [370.0;490.8] | Â | Â | Â | Â |
Lab finding | Â | Â | Â | Â | Â |
 WBC (×10³/mm³) | 6.7 [5.8; 8.3] | 4.8 [ 4.0;5.9] | 5.2 [ 4.2; 6.0] | 4.8 [ 3.9;5.6] | p < 0.001 |
 Neutrophil (%) | 58.4 [51.4;64.2] | 55 [48.1;61.6] | 57.1 [49.2;60.6] | 53.3 [46.8;61.9] | p = 0.008 |
 Lymphocyte (%) | 29.2 [23.4;35.7] | 34.3 [28.6;40.4] | 33.6 [28.8;38.5] | 35.6 [28.6;41.7] | p < 0.001 |
 CRP (mg/dL) | 0.8 [0.4; 1.9] |  |  |  |  |
 Fibrinogen (mg/dL) | 304.5 [256.5;347.0] |  |  |  |  |