Table 4.

Relative risk (RR) for in-hospital mortality using Cox proportional hazards model

RIFLE categories	Patient number (%)	RR*	95% CI	P
RIFLE - R	29 (29.6)	1.000	Reference
RIFLE - I	27 (27.6)	2.121	0.913-4.927	0.080
RIFLE - F	20 (20.4)	3.194	1.262-8.085	0.014

* Adjusted for age (≧ 65 years vs < 65 years), cardiac failure (with vs without), pre-RRT SOFA scores, and RRT modality (CVVH vs hemodialysis); CVVH = continuous venovenous hemofiltration; 95% CI = 95% confidence interval; RR = relative risk; RRT = renal replacement therapy; SOFA = Sequential Organ Failure Assessment.