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Table 4 Mortality risk from perforated peptic ulcer according to Boey et al 32, and Irvin33

From: Pre-operative risk scores for the prediction of outcome in elderly people who require emergency surgery

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%