Table 3.

Reclassification tables and net reclassification index (NRI)

	Surviving patients						Mortality events
PIM-2\PIM-3	0–1%	1.01–5%	5.01–14%	14.01–29%	>29%	Total	0–1%	1.01–5%	5.01–14%	14.01–29%	>29%	Total
0–1%	236	91	1	0	0	328	1	1	0	0	0	2
1.01–5%	39	162	18	0	0	219	0	1	1	0	0	2
5.01–14%	2	35	33	2	0	72	0	1	5	0	0	6
14.01–29%	3	8	26	17	0	54	0	0	4	3	0	7
>29%	0	0	7	9	6	22	0	0	3	2	5	10
Total	280	296	85	28	6	695	1	3	13	5	5	27

Among the patients who died, patients correctly reclassified in the higher risk categories by PIM-3 were 2 divided by the total number of patients who died (n = 27), which is equivalent to 7.4% (Bold squares). However, 10 patients were incorrectly reclassified in the lower risk categories (37%). Among the patients who survived, those correctly reclassified in the lower risk categories were 129 divided by the total number of patients who survived (695), which is equivalent to 18.6% (Italic squares), while 111 were incorrectly reclassified in the higher risk categories (16.1%). The NRI is the sum of the percentages of patients reclassified in surviving and nonsurviving groups: (7.4–37.0%)+(18.6–16.1%)=−29.6%+2.45%=−27.1%