Table 1. General characteristics, clinical presentation and biochemical indices.
| Variables | Non-COPD (n=736) | COPD (n=98) | P value |
|---|---|---|---|
| Age, years | 68.1±10.7 | 68.6±11.2 | 0.6U |
| Male gender, % | 58.3 | 78.6 | <0.001P |
| Body mass index, kg/m2 | 27.4±5.4 | 26.2±5.5 | 0.2U |
| Hypertension, % | 88.8 | 88.8 | 0.98P |
| Diabetes, % | 52.8 | 37.8 | 0.005P |
| Renal failure, % | 16.0 | 17.3 | 0.74P |
| Coronary artery disease, % | 32.3 | 49.0 | 0.001P |
| Stroke/transient ischemic attack, % | 8.7 | 7.1 | 0.6P |
| Smoking, % | 59.4 | 75.8 | 0.07P |
| Prior PTA, % | 19.0 | 32.0 | 0.001P |
| Prior bypass surgery, % | 9.7 | 18.4 | 0.008P |
| Biochemical indices | |||
| Hemoglobin, g/dL | 13.6±1.6 | 14.2±1.3 | 0.45S |
| Platelet count, ×1,000/µL | 240.9±69.1 | 218.7±71.6 | 0.59S |
| Creatinine, µmol/L | 88.4±47.6 | 81±12.2 | 0.65U |
| eGFR, mL/min/1.73 m2 | 54.8±11.8 | 60±12.4 | 0.26U |
| Clinical presentation before angioplasty | |||
| Rutherford classification (15), % | 0.87CA | ||
| 0 | 0 | 0 | |
| 1 | 2.6 | 4.3 | |
| 2 | 16.1 | 13.0 | |
| 3 | 13.9 | 9.8 | |
| 4 | 17.9 | 26.1 | |
| 5 | 16.5 | 13.0 | |
| 6 | 33.0 | 33.8 | |
| Fontaine scale (16), % | 0.82CA | ||
| 2a | 2.7 | 4.3 | |
| 2b | 31.2 | 22.8 | |
| 3 | 16.8 | 26.1 | |
| 4 | 49.3 | 46.8 | |
| Wagner scale (17), % | 0.23CA | ||
| 0 | 4.6 | 0 | |
| 1 | 13.7 | 12.5 | |
| 2 | 8.8 | 4.2 | |
| 3 | 0.4 | 0 | |
| 4 | 67.1 | 75.0 | |
| 5 | 5.4 | 8.3 | |
CA, Cochran-Armitage test for trend; eGFR, estimated glomerular filtration rate; P, Pearson’s chi-squared test; PTA, percutaneous transluminal angioplasty; S, Student’s t-test; U, Mann-Whitney U test; COPD, chronic obstructive pulmonary disease.