Table 6. Comparison of morbidity predicted by POSSUM scoring to actual morbidity.

POSSUM, Physiologic and Operative Severity Score for the Study of Mortality and Morbidity.

POSSUM predicted morbidity	Number of patients	Predicted number of morbidity	Observed number of morbidity	Observed:Expected
0.00-0.10	0	0	0	0
0.11-0.20	0	0	0	0
0.21-0.30	0	0	0	0
0.31-0.40	0	0	0	0
0.41-0.50	0	0	0	0
0.51-0.60	8	5	4	0.8
0.61-0.70	29	19	10	0.53
0.71-0.80	53	38	33	0.87
0.81-0.90	59	53	44	0.83
0.91-1.00	1	1	1	100
0.00-1.00	150	116	92	0.79