Table 4.

Area under the ROC curve, 95% CI, Sensitivity, Specificity, Accuracy, positive predictive value, negative predictive value and Youden’s index of the index assessment methods.

		Sensitivity (%)	Specificity (%)	AUC	95% CI	SE	PPV (%)	NPV (%)	Youden’s Index (J)	Accuracy (%)
At Enamel Threshold	Visual-tactile (FDI)	98.82	88.73	0.940	0.890–0.972	0.0192	91.306	98.432	0.8771	94.27
	VistaCam	98.82	76.06	0.874	0.812–0.922	0.0262	83.177	98.175	0.7521	88.54
	DIAGNOdent	100.00	81.69	0.898	0.839–0.940	0.0275	86.740	100	0.8194	91.72
At Dentin Threshold	Visual-tactile (FDI)	57.45	98.09	0.866	0.819–0.912	0.0238	90.474	87.951	0.555	88.73
	VistaCam	8.51	100.00	0.695	0.647–0.743	0.0247	100.00	77.584	0.335	79.31
	DIAGNOdent	89.36	96.82	0.951	0.912–0.976	0.0161	89.872	96.646	0.861	95.10

AUC Area Under ROC curve, 95% CI 95% confidence interval, SE Standard Error, PPV Positive Predictive Values, NPV Negative Predictive Values.