Table 1

Averaged normalised diffuse reflectance spectral intensity at oxygenated haemoglobin dips (545 and 575 nm) and intensity ratio (R545/R575) for different tissue types

Tissue types	Spectral intensity		Intensity ratio
Tissue types	At 545 nm	At 575 nm	R545/R575
Normal/healthy	0.44±0.05	0.56±0.06	0.78±0.06
Hyperplasia	0.41±0.01	0.51±0.01	0.80±0.01
Dysplasia	0.39±0.07	0.47±0.07	0.83±0.07
Squamous-cell carcinoma	0.36±0.07	0.41±0.11	0.88±0.08
p Value	<0.001	<0.001	<0.005