Table 3. Az values, standard errors and significance levels for each observer's first reading.

	Observer 1		Observer 2		Observer 3
	Az (SE)	P-value	Az (SE)	P-value	Az (SE)	P-value
Visual inspection	0.805 (0.040)	<0.001	0.838 (0.039)	<0.001	0.792 (0.044)	<0.001
Intraoral film	0.803 (0.042)	<0.001	0.882 (0.032)	<0.001	0.819 (0.041)	<0.001
Intraoral CCD sensor	0.850 (0.039)	<0.001	0.914 (0.029)	<0.001	0.820 (0.042)	<0.001
Intraoral PSP sensor	0.825 (0.041)	<0.001	0.844 (0.039)	<0.001	0.801 (0.044)	<0.001
Cone beam CT	0.877 (0.036)	<0.001	0.920 (0.028)	<0.001	0.853 (0.040)	<0.001

CCD, charge-coupled device; PSP, photostimulable phosphor; SE, standard error