Table 4.

ROC curve analysis (each group vs. controls)

Parameter		Malignant	Potentially malignant	AUC difference [95%CI]	Z value	P value*
Sensitivity [95% CI]		100.0 [78.2–100.0]	93.3 [68.1–99.8]	0.003[-0.006:0.013]	0.71	0.480
Specificity [95% CI]		100.0 [69.2–100.0]	100.0 [69.2–100.0]
Cut off value**		≥ 6.2	≥ 6.2
AUC	AUC [95%CI]	1 [1]	0.997 [0.857-1]
	SE	0.00	0.006

*For the difference in AUC, ** at or above which event (i.e., disease) occurs