Table 3.

Performance metrics for models predicting postoperative acute kidney injury

Model	Sensitivity	Specificity	Accuracy	PPV	NPV	AUROC	AUPRC
ASA	0.56 (0.49, 0.64)	0.66 (0.60, 0.71)	0.62 (0.57, 0.66)	0.52 (0.45, 0.60)	0.69 (0.63, 0.75)	0.61 (0.57, 0.66)	0.48 (0.42, 0.55)
Preoperative model	0.78 (0.72, 0.84)	0.54 (0.48, 0.60)	0.64 (0.60, 0.69)	0.54 (0.48, 0.60)	0.78 (0.71, 0.84)	0.68 (0.63, 0.73)	0.58 (0.51, 0.65)
Perioperative model	0.84 (0.78, 0.89)	0.60 (0.54, 0.66)	0.70 (0.65, 0.74)	0.59 (0.53, 0.65)	0.85 (0.79, 0.89)	0.77 (0.73, 0.81)	0.70 (0.62, 0.76)

Abbreviations: ASA, American Society of Anesthesiologists physical status classification; PPV, positive predictive value; NPV, negative predictive value; AUROC, area under the operating receiver curve; AUPRC, area under the precision-recall curve; NRI, net reclassification improvement index