Table 2 Correspondence between the Kudo pit pattern classification (by narrow-band imaging (NBI)) and histopathology (the gold standard) of all detected lesions

NBI classification	Histopathology		Total
NBI classification	Neoplastic	Non-neoplastic	Total
Suspicious	12	16	28, PPV 43%
Non-suspicious	4	66	70, NPV 94%
Total	16,sens. 75%	82,spec. 81%	98

Kudo pit pattern type I–II was considered as non-suspicious and Kudo type III–V as suspicious for neoplasia.
NPV, negative predictive value; PPV, positive predictive value; sens., sensitivity; spec., specificity.