Table 2. Performance indicators of image parameters, the mean red to blue (R/B) and red to green (R/G) intensity ratios, and the mean image hue and intensity values, used to discriminate between normal (n=28) and SCC (n=12) oral tissue.

Image parameter	Area under ROC curve (±s.e.)	P-value	Cutoff value	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
Mean R/B	1.0 (±0.0)	<0.0001	>0.740	100	100	100	100
Mean R/G	0.9464 (±0.03)	0.0002	>2.509	100	75	63	100
Mean hue	1.0 (±0.0)	<0.0001	>198.0	100	100	100	100
Mean intensity	0.9554 (±0.03)	<0.0001	>45.31	100	71	60	100