Table 4.

Univariate and Multivariate Analysis for Predictor of Postoperative AKI

Variables	Univariate Analysis		Model 1		Model 2
			Multivariate Analysis		Multivariate Analysis
	OR (95% CI)	P Value	Adjusted OR (95% CI)	P Value	Adjusted OR (95% CI)	P Value
Diabetes mellitus	2.5 (1.1–5.9)	0.030	2.4 (0.9–6.6)	0.08	2.5 (0.9–6.7)	0.06
Preoperative hemoglobin ≤11.6 g/dL	13.4 (3.9–46)	<0.001	7.6 (2.0–32.3)	0.004	8.2 (2.1–34.3)	0.002
RBC transfusions during CPB ≥2 U	5.2 (1.9–13.7)	<0.001	3.3 (1.0–11.1)	0.041	3.2 (1.0–10.8)	0.048
Nadir hemoglobin ≤7.4 g/dL	3.0 (1.3–7.0)	0.009	1.4 (0.4–5.3)	0.58	1.0 (0.3–3.9)	0.99
Nadir DO2 ≤265 mL/min per m2	3.0 (1.2–7.4)	0.012	1.7 (0.4–7.7)	0.48	1.4 (0.3–5.3)	0.65
Largest AUC below the ${\text{DO}}_2^{300}$ ≥880	5.4 (2.1–13.7)	<0.001	4.9 (1.2–21.5)	0.022
Cumulative AUC below the ${\text{DO}}_2^{300}$ ≥1555	3.3 (1.4–7.8)	0.006			1.0 (0.3–4.3)	0.95

AKI indicates acute kidney injury; AUC, area under the curve; DO₂, oxygen delivery; OR, odds ratio; and RBC, red blood cell.