Table 3. Narrow-band imaging (NBI) assessment of microvascular density and histological assessment of vascular density in the surrounding non-carcinomatous mucosa.

	Non-carcinomatous mucosa surrounding differentiated type carcinoma	Non-carcinomatous mucosa surrounding undifferentiated type carcinoma	P value
NBI microvascular density, %	5.82 ± 3.39	10.99 ± 3.94	< 0.001
Histological vascular density, %
Whole mucosal layer	3.10 ± 1.27	7.40 ± 2.51	< 0.001
Surficial mucosal layer (0 – 100 μm)	2.49 ± 1.11	6.68 ± 3.68	< 0.001