Table 2.
Patient characteristics: comparison of derivation and validation sets.
| Characteristic | Derivation (n = 423) | Validation (n = 140) |
|---|---|---|
| Dichotomous Variables: n (%) | ||
| Female gender | 128 (30.3) | 37 (26.4) |
| Diabetes Mellitus | 154 (36.3) | 57 (40.4) |
| Hypertension | 251 (59.3) | 69 (49.3) |
| Prior CABG surgery | 3 (0.7) | 1 (0.7) |
| Uremia or end-stage renal disease | 12 (2.8) | 3 (2.1) |
| Stroke or transient ischemic attack | 26 (6.1) | 9 (6.4) |
| Peripheral vascular disease | 13 (3.1) | 4 (2.9) |
| Liver disease* | 1 (0.2) | 0 (0) |
| COPD | 12 (2.8) | 3 (2.1) |
| Complicated PCI | 8 (1.9) | 3 (2.1) |
| Cardiogenic shock | 10 (2.4) | 2 (1.4) |
| Prior endotracheal intubation* | 2 (0.5) | 0 (0) |
| Prior CPR* | 1 (0.2) | 0 (0) |
| Recent myocardial infarction | 28 (6.6) | 10 (7.1) |
| Categorical Variables: n (%) | ||
| Priority of surgery | ||
| • Emergent | 7 (1.7) | 2 (1.4) |
| • Urgent | 7 (1.7) | 3 (2.1) |
| • Elective | 409 (96.7) | 135 (96.4) |
| Left ventricular ejection fraction | ||
| • ≦30% | 11 (2.6) | 2 (1.4) |
| • 31–40% | 36 (8.5) | 15 (10.7) |
| • 41–50% | 32 (7.6) | 15 (10.7) |
| • >50% | 344 (81.3) | 108 (77.1) |
| Coronary artery stenosis | ||
| • Left main disease | 118 (27.9) | 36 (25.7) |
| • Three-vessel disease | 276 (65.2) | 98 (70.0) |
| • Others | 29 (6.9) | 6 (4.3) |
| Continuous Variables: mean (SD) | ||
| Age (yr) | 64.0 (10.4) | 63.3 (9.7) |
| Serum creatinine (mg/dL) | 1.4 (1.3) | 1.5 (1.6) |
| Hematocrit (%) | 37.7 (5.5) | 37.7 (4.7) |
| Serum albumin (g/dL) | 4.0 (1.5) | 3.9 (0.5) |