Narrow band imaging and white light endoscopy in the characterization of a polypectomy scar: A single-blind observational study

Table 2 Characteristics between groups at protocol study

	WLE-NBI (n = 57)	NBI-WLE (n = 55)	P value
Sex (male, %)	54.4	60.0	0.36
Age (yr)	67.3	68.2	0.65
BMI (mean)	28.2	27.0	0.23
Baseline polyp size			0.002
10-19 mm	16 (28.1)	31 (56.4)
20-39 mm	30 (52.6)	22 (40.0)
≥ 40 mm	11 (19.3)	2 (3.6)
Location, right sided (%)	79.0	78.2	0.92
Paris Classification			0.34
0-Is	26 (45.6)	22 (40.0)
0-IIa	22 (38.6)	28 (50.9)
Other Combinations	9 (15.8)	5 (9.1)
NICE Classification			0.90
NICE I	8 (14.0)	9 (16.4)
NICE II	48 (84.2)	46 (83.6)
NICE III	1 (1.8)	0 (0)
Baseline histology			0.78
Hyperplastic	2 (3.5)	2 (3.6)
Adenoma with LGD	26 (45.6)	27 (49.1)
Adenoma with HGD	22 (38.6)	17 (30.9)
Sessile Serrated Adenoma (SSA)	5 (8.8)	6 (10.9)
Traditional serrated adenoma	0 (0)	2 (3.6)
Adenocarcinoma (pT1 stage)	2 (3.5)	1 (1.8)
Morphology of scar on site 1			0.12
Flat	29 (50.9)	20 (36.4)
Nodular elevated	28 (49.1)	35 (63.6)
Presence of clips on scar	3 (5.3)	8 (14.6)	0.12
Residual neoplasia on histology assessment			0.74
Negative	38 (66.7)	35 (63.6)
Positive	19 (33.3)	20 (36.4)
Polyps resected (mean, SD)	2.4 (2.7)	2.4 (2.7)	0.92
Mean time baseline EPMR colonoscopy (min)	55.9	51.9	0.38

WLE: White light endoscopy; NBI: Narrow band imaging; BMI: Body mass index; LGD: Low-grade dysplasia; HGD: High-grade dysplasia; EPMR: Endoscopic piecemeal mucosal resection.