Table 4. Discrimination and reclassification of the combination of serum magnesium for predicting AKI.

Established clinic model included age, the history of stroke and hypertension, preoperative LVDD, D-dimer, baseline eGFR, ASA ≥3, CPB time, total bilirubin and SOFA score. LVDD left ventricular end-diastolic diameter, CPB cardiopulmonary bypass, ASA American Society of Anesthesiologists, SOFA sequential organ failure assessment, AKI acute kidney injury, AUC-ROC area under the curve receiver-operator characteristic curve, CI confidence interval, NRI net reclassification improvement, and IDI integrated discrimination improvement. <br>*Estimated differences between two groups

	AUC-ROC (95%CI)	P value	NRI	P value	IDI	P value
Model 1: Established risk factor <br>model	0.808 (0.751–0.865)		Reference		Reference
Model 2: Established risk factor <br>model + Magnesium	0.833 (0.782–0.883)	0.050*	0.47*	< 0.001	0.04*	0.002