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

Table 1 Baseline patient’s characteristics n (%)

Total number of lesions	112
Mean age, years (SD)	67.7 (10.1)
Sex ratio, % male	57.1
Weight (Kg, SD)	74.7 (15.4)
BMI (Kg/m2, SD)	27.6 (5.1)
Family History of CRC	27 (24.1)
Personal History of CRC	7 (6.3)
Current smoking	20 (17.9)
Diabetes	19 (17.0)
Lesion size, mm (median, interquartile range)	20 (14-30)
Categorical size
10-19 mm	47 (42.0)
20-39 mm	52 (46.4)
≥ 40 mm	13 (11.6)
Location of the lesion
Cecum	15 (13.4)
Ascending	53 (47.3)
Transverse	20 (17.9)
Descending	4 (3.6)
Sigmoid	10 (8.9)
Rectum	10 (8.9)
ASA classification
ASA I	18 (16.1)
ASA II	56 (50.0)
ASA III	38 (33.9)
Paris classification
0-Is	48 (42.9)
0-IIa	50 (44.6)
Other combinations (IIa + Is/IIc)	14 (12.5)
NICE classification
NICE I	17 (15.2)
NICE II	94 (83.9)
NICE III	1 (0.9)
Number of resected pieces
2-5 pieces	46 (41.1)
> 5 pieces	66 (58.9)
Baseline histology
Hyperplastic	4 (3.6)
Adenoma with LGD	53 (47.3)
Adenoma with HGD	39 (34.8)
Sessile serrated adenoma (SSA)	11 (9.8)
Traditional serrated adenoma (TSA)	2 (1.8)
Adenocarcinoma (pT1 stage)	3 (2.7)
Use of clips	59 (52.7)
Clips per lesion (median, interquartile range)	3 (1-3)
Use of clips
Prophylactic	56 (94.9)
Intraprocedural bleeding	2 (3.4)
Suspicion of deep mural injury	1 (1.7)
Tattooed lesion after EPMR	38 (33.9)
Endoscopist who performed piecemeal EMR
Expert endoscopists	98 (87.5)
General gastroenterologists	14 (12.5)
Median time to review (months, interquartile range)	3.9 (3.0-5.3)

BMI: Body mass index; ASA: American society of anesthesia; CRC: Colorectal cancer; EMR: Endoscopic mucosal resection; LGD: Low-grade dysplasia; HGD: High-grade dysplasia; EPMR: Endoscopic piecemeal mucosal resection.