The Procedural Index for Mortality Risk (PIMR): an index calculated using administrative data to quantify the independent influence of procedures on risk of hospital death

Table 5 Results of the Net Reclassification Improvement (NRI) analysis:

Discharge status (N)	Correct reclassification*		Incorrect reclassification^†		Net correct reclassification^‡
	%	N	%	N	%	N
Dead (4040)	33.6	1 357	66.4	2 683	-32.8	-1 325
Alive (133690)	57.2	76 471	42.8	57 219	+14.4	+19 251
Overall net correct reclassification					-18.4	+17 926

*Correct reclassification: 'up' for events and 'down' for non-events, where 'up' is a higher predicted risk of death from the new vs old model and 'down' is a lower predicted risk of death from the new vs old model
^†Incorrect reclassification: 'down' for events and 'up' for non-events
^‡Net correct reclassification: correct reclassification - incorrect reclassification

ISSN: 1472-6963