Table III.
Cox proportional hazards model.
| Parameter | Wald χ2 | Hazard ratio (HR) | CI | p-value |
|---|---|---|---|---|
| Age (HR per 10 years) | 196 | 1.7 | (1.6,1.8) | <0.0001 |
| Coronary artery disease | <0.0001 | |||
| Three-vessel | 32 | 1.8 | (1.5,2.2) | |
| Two-vessel | 20 | 1.5 | (1.3,1.9) | |
| One-vessel | 7 | 1.3 | (1.1,1.5) | |
| White race | 29 | 0.7 | (0.6,0.8) | <0.0001 |
| Renal failure | 18 | 1.9 | (1.4,2.5) | <0.0001 |
| COPD | 15 | 1.5 | (1.2,1.8) | <0.0001 |
| Diabetes | 14 | 1.4 | (1.2,1.7) | 0.0002 |
| History of MI | 13 | 1.3 | (1.1,1.5) | 0.0003 |
| Endocarditis | 10 | 1.7 | (1.2,2.4) | 0.0003 |
| Acute presentation | 8 | 1.2 | (1.1,1.4) | 0.0040 |
| Congenital etiology | 8 | 0.8 | (0.6,0.9) | 0.0050 |
| Hyperlipidemia | 5 | 0.8 | (0.7,0.9) | 0.0200 |
| Utilization of left IMA | 4 | NA | NA | 0.0600 |
| Depressed ejection fraction | 3 | NA | NA | 0.0700 |
| Mechanical vs. tissue replacement | 1 | NA | NA | 0.4400 |
CI: Confidence interval; COPD: Chronic obstructive pulmonary disease; IMA: Internal mammary artery; MI: Myocardial infarction; NA: Not available.