. Author manuscript; available in PMC: 2013 Jul 29.

Published in final edited form as: J Cardiovasc Med (Hagerstown). 2012 Apr;13(4):246–253. doi: 10.2459/JCM.0b013e3283516767

Table 3b.

Simplified/optimized renal risk classification

BUN Strata	ΔCr	In-hospital death, % (n)	Risk Ratio (95% CI)^*
BUN ≤ 30	<0.6	0.8% (34/4629)	1.0
BUN ≤ 30	≥0.6	6.3% (40/635)	9.09 (5.71 –14.5)
BUN > 30	<0.8	3.5% (62/1784)	4.87 (3.19 –7.42)
BUN > 30	0.8	19.7% (68/346)	33.06 (21.5 –50.8)
BUN Strata	ΔCr cutpoint	Post-discharge death % (n)	Risk Ratio^*
BUN ≤ 30	<0.1	16.8% (218/1298)	1.0
BUN ≤ 30	≥0.1	22.0% (673/3055)	1.4 (1.18 –1.66)
BUN > 30	<0.3	41.0% (422/1030)	3.44 (2.84 –4.16)
BUN > 30	≥0.3	53.3% (339/749)	4.1 (3.34 –5.03)

Compared to lowest risk group (i.e. BUN 30 and ΔCr below threshold)