Table 2.

Odds ratios for AKI according to fHb ratio at the end of CPB (N=110)

Models	OR (95%CI)	p	AUC (95%CI)
Model 1	2.3 (1.3-4.1)	0.004	0.742 (0.650-0.834)
Model 2	2.6 (1.5-4.8)	0.001	0.783 (0.692-0.875)
Model 3	2.3 (1.2-4.4)	0.011	0.781 (0.687-0.875)
Model 4	2.6 (1.4-4.8)	0.003	0.794 (0.708-0.881)

Model 1: adjustment for demographics (i.e., age, gender, and BMI); Model 2: adjustment for comorbidities (i.e., current smoker, hypertension, vascular disease, COPD, severe heart failure, PAH, and AF) and baseline renal function (eGFR); Model 3: adjustment for EUROscore II and intraoperative risk factors (i.e., time of CPB, time of cross-aortic clamping, fluid balance during operation, blood transfusion, and highest VIS during operation); Model 4: adjustment for EUROscore II and postoperative risk factors (i.e., fluid balance and highest VIS in the first 24 hours, duration of mechanical ventilation, and vasoactive/inotropic drugs). fHb, free hemoglobin; BMI, body mass index; COPD, chronic obstructive pulmonary disease; PAH, pulmonary artery hypertension; AF, atrial fibrillation; eGFR, estimated glomerular filtration rate; EUROscore II, European System for Cardiac Operative Risk Evaluation II; CPB, cardiopulmonary bypass; VIS, vasoactive-inotropic score; OR, odds ratio; CI, confidence interval.