Antimicrobial prophylaxis in patients with colorectal lesions undergoing endoscopic resection

Table 1 Clinical characteristics of inpatients, lesions and treatment modality n (%)

Characteristic	Antibiotic group(n = 107)	Control group(n = 107)	P value1
Age (yr)	68.1 ± 12.5 (42-86)	63.1 ± 9.5 (39-82)	0.7322
Gender (M:F)	62:45	68:39	0.421
Tumor size
< 10 mm	22 (20.5)	19 (17.8)	0.602
10-20 mm	60 (56.1)	65 (60.7)	0.488
> 20 mm	25 (23.4)	23 (21.5)	0.743
Macroscopic type
Pedunculated	14 (13.0)	16 (15.0)	0.694
Subpedunculated	32 (29.9)	30 (28.0)	0.763
Sessile	24 (22.4)	22 (20.6)	0.739
Flat elevated (0-IIa)	28 (26.2)	30 (28.0)	0.758
Flat (0-IIb, 0-IIc)	9 (8.5)	9 (8.5)	1.000
Location
Rectum and sigmoid	58 (54.2)	61 (57.0)	0.680
Descending	23 (21.5)	19 (17.8)	0.491
Transverse	12 (11.2)	14 (13.1)	0.676
Ascending and cecum	14 (13.1)	13 (12.1)	0.741
Treatment modality
ESD	45 (42.1)	42 (39.3)	0.676
EMR	62 (57.9)	65 (60.7)	0.676

¹Fisher’s exact test (excluding variable age);

²Student’s t-test. ESD: Endoscopic submucosal dissection; EMR: Endoscopic mucosal resection.