Table 4.

Sensitivity, specificity, PPV and NPV for both observers

Image type	Sensitivity	[95% conf. interval]	Specificity	[95% conf. interval]	PPV	[95% conf.interval]	NPV	[95% conf. interval]	Accuracy
CBCT	0.891	0.646–0.889	0.899	0.596–0.982	0.897	0.625–0.885	0.899	0.591–0.882	0.819
Digora	0.881	0.646–0.899	0.893	0.596–0.982	0.891	0.616–0.885	0.891	0.586–0.882	0.809
Thz video	0.749	0.468–0.888	0.759	0.397–0.892	0.758	0.469–0.911	0.756	0.397–0.812	0.747
Thz static	0.799	0.513–0.889	0.777	0.434–0.903	0.755	0.457–0.911	0.801	0.491–0.843	0.783

CBCT, cone beam CT; NPV, negative-predictive value; PPV, positive-predictive value;