Table 1.

Receiver operator curve of using the mean-backscattered intensity (mR) threshold values to assess subsurface enamel interface.

Threshold Values (dB)	Sensitivity (%)	Specificity (%)
$>8.1$	100	60
$>10.1$	100	67
$>12.3$**	100	80
$>15.5$	80	87
$>20$	50	100

Note: Asterisks (**) denotes the Youden index J.