Relationship between perioperative mortality and patient characteristics
| Characteristic | Univariate OR (95% CI), xp value | Multiple variable OR (95% CI), p value |
| Tissue prosthesis | 1.63 (1.25 to 2.12), p<0.001 | 0.91 (0.64 to 1.29), p=0.59 |
| Age (in 10 year increments) | 1.46 (1.29 to 1.65), p<0.001 | 1.53 (1.27 to 1.86), p<0.001 |
| Male gender | 0.78 (0.61 to 0.99), p=0.04 | 0.93 (0.69 to 1.25), p=0.62 |
| Concomitant CABG | 1.48 (1.15 to 1.91), p=0.002 | 1.35 (1.01 to 1.82), p=0.05 |
| Greater than first operation | 3.19 (1.62 to 6.29), p=0.001 | 2.13 (0.72 to 6.29), p=0.17 |
| Creatinine (in 10 unit increments) (mmol/l) | 1.03 (1.02 to 1.05), p<0.001 | 1.05 (1.03 to 1.06), p<0.001 |
CABG, coronary artery bypass grafting.