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

Table 3

Results of Scheffe test.

Observers	Groups	Mean difference	Standard error	P value	Asymptotic 95% confidence interval
					Lower bound	Upper bound
1	2	−0.057	0.089	.811	−0.27	0.16
	3	0.531(^*)	0.089	.000	0.31	0.75
2	1	0.057	0.089	.811	−0.16	0.27
	3	0.589(^*)	0.089	.000	0.37	0.81
3	1	−0.531(^*)	0.089	.000	−0.75	−0.31
	2	−0.589(^*)	0.089	.000	−0.81	−0.37

^* The mean difference is significant at the 0.05 level.