Table 4.

Sensitivity, specificity and predictive values for new caries lesions (ΔDFS > 0) over 3 years

Cariogram cut-off, %	TP + TNa	Sensitivity	Specificity	PPVb	NPVb	Youden’s indexc
80	53.1	89.2	33.5	42.0	85.3	0.23
60	65.8	61.3	71.0	53.3	77.3	0.32
40	67.8	25.6	90.6	59.5	69.3	0.16
20	65.8	11.9	94.8	55.4	66.6	0.07

^aProportion of true positive (TP) and true negative (TN) tests.

^bPPV = positive predictive value; NPV = negative predictive value.

^cJ = sensitivity + specificity −1.