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Mortality risk from perforated peptic ulcer according to Boey et al 32, and Irvin33
| Risk Factors | No. of Risk Factors | Risk of Mortality | |
| Boey | Irvin | ||
| 0 | 0 | 11% | |
| Preoperative BP < 100 mmHg | 1 | 10% | 27% |
| Delayed presentation > 24 h | 2 | 45.5% | 55% |
| Major medical illness present | 3 | 100% | 100% |
