4.

改良POSSUM预测与实际术后并发症发生的例数对比

The comparison between predicted and actual complition cases

R1 (%)	n	Average R1 (%)	Predicted	Actual	O/E
R1: postoperative complications' incidence rate; O/E: observed to expected ratio.
0-10	2	6.2±1.84	0	0	1.00
11-20	18	15.5±2.55	3	4	1.33
21-30	44	27.8±2.87	13	17	1.30
31-40	10	35.0±5.65	4	4	1.00
41-50	17	44.1±2.31	8	7	0.88
51-60	32	55.8±3.34	18	17	0.95
61-70	9	64.2±2.82	6	5	0.83
71-80	4	72.3±3.51	3	3	1.00
> 80	2	85.1±4.16	2	2	1.00