Non-guided self-learning program for high-proficiency optical diagnosis of diminutive and small colorectal lesions: A single-endoscopist pilot study

Table 2 Lesion characteristics n (%)

Characteristic		1-5 mm	6-9 mm
Number of lesions by size		399 (76.4)	123 (23.6)
Paris classification
	0-Ip	3 (0.7)	22 (17.9)
	0-Is	273 (68.4)	88 (71.5)
	0-IIa	117 (29.3)	11 (8.9)
	0-IIc	2 (0.5)	0
	0-IIa + IIc	3 (0.7)	0
	0-IIb	1 (0.2)	2 (1.6)
Pathology
	Adenoma	255 (63.9)	97 (78.9)
	Hyperplastic	106 (26.6)	17 (13.6)
	SSP	8 (2.0)	7 (5.6)
	Other	26 (6.5)	1 (0.8)
	Lost/not enough sample	4 (1.0)	1 (0.8)
Location
	Proximal	248 (62.2)	56 (45.5)
	Distal	151 (37.8)	67 (54.5)
Optical diagnosis1
	NICE 1	288 (72.2)	102 (82.9)
	NICE 2	110 (27.6)	20 (16.3)
High-confidence diagnosis		347 (87.0)	116 (94.3)

¹Only available for 520 lesions (1 lesion excluded because a poor approach to application of narrow band imaging, and 1 subepithelial lesion). NBI: Narrow band imaging; NICE: NBI International Colorectal Endoscopic classification system; SSP: Sessile serrated polyp.