Risks of complication by PS (n = 5549)
| PS 0–9 | PS 10+ | p Value | |
| Cerebrovascular accident (stroke) | 1.0% | 3.5% | < 0.01 |
| Intra-aortic balloon pump | 2.7% | 8.4% | < 0.01 |
| Haemofiltration | 2.1% | 12.3% | < 0.01 |
| Resternotomy | 3.4% | 6.1% | < 0.01 |
| Tracheostomy | 0.9% | 4.2% | < 0.01 |
| Risk of at least one complication | 4.7% | 15.2% | < 0.01 |
p Value, degree of significance between PS 0–9 versus PS 10+.