Table 5. Calibration of PIM in five intervals of mortality risk.

Risk %	Number of patients	Observed survival	Expected survival	Observed death	Expected death
PIM
0–1	6	6	5.96	0	0.04
>1–5	75	73	73.61	2	1.33
>5–15	21	13	19.01	8	1.99
>15–30	9	1	6.98	8	2.02
>30–100	9	1	3.77	8	5.23
Total	120	94	109.39	26	10.61