Table 4. Anemia and hemoglobin AUC as risk factors for AKI in cardiac surgery^*.

Variable	OR	95% CI	p value
Preoperative hemoglobin (Hb1)	0.80	0.74–0.87	<0.05
Preoperative anemia	2.58	1.92–3.45	<0.05
IO minimum hemoglobin (Hb2)	0.84	0.77–0.92	<0.05
IO anemia	1.32	1.00–1.75	0.05
pHb-AUC	0.85	0.80–0.91	<0.05
pHb-AUC <19 g/dl	1.75	1.30–2.35	<0.01

*Values were adjusted by transfusion

AKI: acute kidney injury; CI: confidence interval; IO: intraoperative; pHb-AUC: perioperative hemoglobin area under the curve; OR: odds ratio