Table 5.

Pairwise comparisons between Area under the ROC curve of index assessment methods.

At Enamel threshold	Visual-tactile (FDI) and VistaCam
	Difference between areas	0.0654
	SE	0.0237
	95% CI	0.0190 to 0.112
	z-statistics	2.761
	Significance level	P = 0.0058*
	Visual-tactile (FDI) and DIAGNOdent
	Difference between areas	0.0422
	SE	0.0267
	95% CI	−0.0102 to 0.0945
	z-statistics	1.578
	Significance level	P = 0.1145
	VistaCam and DIAGNOdent
	Difference between areas	0.0232
	SE	0.0181
	95% CI	−0.0123 to 0.0587
	z-statistics	1.279
	Significance level	P = 0.2008
At Dentin threshold	Visual-tactile (FDI) and VistaCam
	Difference between areas	0.171
	SE	0.0262
	95% CI	0.119 to 0.222
	z-statistics	6.521
	Significance level	P < 0.0001*
	Visual-tactile (FDI) and DIAGNOdent
	Difference between areas	0.0851
	SE	0.0227
	95% CI	0.0406 to 0.130
	z-statistics	3.745
	Significance level	P = 0.0002*
	VistaCam and DIAGNOdent
	Difference between areas	0.256
	SE	0.0245
	95% CI	0.208 to 0.304
	z-statistics	10.456
	Significance level	P < 0.0001*

^*Significant, SE Standard Error, 95% CI 95% confidence interval.