Table 9. Comparing mortality predicted by P-POSSUM scoring to actual mortality.

P-POSSUM, Portsmouth-POSSUM; POSSUM, Physiological and Operative Severity Score for the Enumeration of Mortality and Morbidity.

P-POSSUM predicted mortality	Number of patients	Predicted number of deaths	Observed number of deaths	Observed:Expected
0.00-0.10	63	9	1	0.11
0.11-0.20	39	6	4	0.67
0.21-0.30	19	3	4	1.33
0.31-0.40	21	3	9	3
0.41-0.50	3	1	1	1
0.51-0.60	3	1	0	0
0.61-0.70	1	1	1	1
0.71-0.80	1	1	1	1
0.81-0.90	0	0	0	0
0.91-1.00	0	0	0	0
0.00-1.00	150	25	21	0.84