The Efficiency of Operating Microscope Compared with Unaided Visual Examination, Conventional and Digital Intraoral Radiography for Proximal Caries Detection

Table 4

The 𝐴_𝑧 values and standard errors for 1st and 3rd observers.

	Test result variable (s)	Area	Std. error (a)	Asymptotic 95% confidence interval
				Lower bound	Upper bound
1st Observer	Unaided visual examination	0.650	0.060	0.546	0.745
	Operating microscope	0.650	0.060	0.546	0.744
	Film radiography	0.800	0.050	0.706	0.875
	RVG	0.793	0.051	0.698	0.869
3rd Observer	Unaided visual examination	0.533	0.062	0.428	0.635
	Operating microscope	0.533	0.062	0.429	0.636
	Film radiography	0.773	0.052	0.677	0.853
	RVG	0.760	0.054	0.662	0.841