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Table 5 Calibration power of POSSUM score for predicting postoperative morbidity

From: Evaluation of the POSSUM, P-POSSUM and E-PASS scores in the surgical treatment of hilar cholangiocarcinoma

  POSSUM
Risk band E O
1 1 0
2 1 2
3 2 2
4 4 6
5 4 3
6 6 7
7 8 7
8 8 7
9 10 10
10 8 8
Total 52 52
  1. POSSUM: Physiological and Operative Severity Score for the enUmeration of Mortality and morbidity; E: expected; O: observed.