Multivariate analysis
| Variable |
Odds ratio |
Parsonnet score | Per cent discrepancies |
| Age | 1.06 | > 7 | 0 |
| Renal failure | 3.6 | 10 | 1 |
| Ejection fraction < 50% | 1.4 | > 2 | 8 |
| Hypertension | 1.4 | 3 | 11 |
| Acute state preoperatively (cardiogenic shock, or IABP not inserted prophylactically) | 2.7 | 10–50 | 0 |
| Ventilated preoperatively | 6.1 | 0 | 0 |
| Redo surgery | 1.8 | > 5 | 0 |
| Operation priority | 1.6 | 0 | 4 |
| CABG and mitral valve surgery | 4.8 | 7 | 0 |
| Double valve surgery | 3.4 | > 10 | 0 |
CABG, coronary artery bypass graft; IABP, intra-aortic balloon pump.