Table 5. Multivariate regression analysis for AKI stage 2 and 3.

	Odds-ratio	95%CI	P-value
Renal Resistive Index	1.008	1.000–1.016	0.043
APACHE III	1.021	1.004–1.039	0.013
Fluid balance (L)	1.348	1.091–1.666	0.006
Variables included:	RRI, APACHE III, norepinephrine dose, fluid balance, phase angle, urinary sodium
Variables removed:	Step 2: Phase angle, step 3: Norepinephrine dose (mL/kg/h), step 4: Urinary sodium mmol/24h
n	93
Hosmer Lemeshow on step 4	8.008 (df = 8, p = 0.433)
Nagelkerke R2 on step 4	0.426