Table 2:

Actual and predicted mortality by risk quintiles

	No. at risk	No. of observed death	Observed death (%)	Predicted death (%)
STS
1st	85	0	0	0.32
2nd	82	0	0	0.66
3rd	69	0	0	1.41
4th	68	2	2.9	2.57
5th	76	9	11.8	10.61
AES
1st	88	0	0	0.50
2nd	96	0	0	2.59
3rd	76	1	1.3	5.87
4th	59	4	6.8	10.95
5th	61	6	9.8	17.70
LES
1st	92	0	0	1.04
2nd	60	0	0	2.60
3rd	76	0	0	3.49
4th	76	5	6.6	6.42
5th	76	6	7.9	25.96