Blood Urea Nitrogen for Short-Term Prognosis in Patients with Cardiogenic Shock Complicating Acute Myocardial Infarction

Table 4

Comparison in predicting 30-day mortality between the standard model and the new model.

30-day mortality
Patients with events					Patients without events
New model					New model
Standard	<20%	20–40%	>40%	All	Standard	<20%	20–40%	>40%	All
<20%	4	0	1	5	<20%	47	2	1	50
20–40%	2	12	6	20	20–40%	10	18	4	32
>40%	1	0	79	80	>40%	0	8	23	31
All	7	12	86	105	All	57	28	28	113
			NRI+ = 0.038				NRI- = 0.097
NRI [95%CI]			0.1354 [0.0323–0.2385]						p = 0.010
IDI [95%CI]			0.0526 [0.0158–0.0894]						p = 0.005

NRI: net reclassification improvement, IDI: integrated discrimination improvement. The NRI was calculated using 20% and 40% as the thresholds to define the risk grade of 30-day mortality.