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Table 4 Stratification of morbidity and mortality according to P-POSSUM Physiological score

From: Application of Portsmouth modification of physiological and operative severity scoring system for enumeration of morbidity and mortality (P-POSSUM) in pancreatic surgery

Physiological Score Morbidity (Predicted) Morbidity (Observed) O:P ratio Mortality (Predicted) Mortality (Observed) O:P ratio
< = 15.00 24.92 35.8 1.4 1.08 (5.8) 5.4
15.1 – 18.00 35.18 46.7 1.3 1.90 (6.7) 3.5
18.1 – 21.00 47.23 50.0 1.1 3.15 (14.3) 4.5
21.1 – 24.00 56.70 70.0 1.2 6.82 (10.0) 1.5
24.00+ 73.85 87.5 1.2 12.12 (25.0) 2.1
  1. O:P, Observed to Predicted Ratio.