Table 1. Receiver operating characteristic (ROC) curve areas for approximal caries detection for observers 1–3 with conventional bitewings and digital bitewings viewed on 17 and 3.5 inch monitors.

Observer	Area under the ROC curve
	Conventional	Digital 3.5 inch	Digital 17 inch
1	0.820	0.827	0.796
2	0.803	0.802	0.774
3	0.813	0.810	0.788
Mean	0.812	0.813	0.786