Table 6.

Results of a Univariate Analysis of Tumor- and Treatment-related Factors and Postoperative Bleeding after Colorectal Endoscopic Submucosal Dissection.

Factors	Total	Present	Absent	p
Number of patients	398	19	379
Tumor location
Colon	290	9 (3.1%)	281 (96.9%)	<0.05
Rectum	108	10 (9.3%)	98 (90.7%)
Lesion size (mm)		35.6±20.2	28.2±13.7	<0.05
Resected size (mm)		40.7±19.8	34.8±13.2	N.S.
Operation time (min)		123.0±108.5	71.6±51.4	<0.05
Invasion morphology
Superficial	328	13 (4.0%)	315 (96%)	N.S.
Protruded	69	6 (8.7%)	63 (91.3%)
Histological type
Adenoma	209	4 (1.9%)	205 (98.1%)	<0.05
Carcinoma	189	15 (7.9%)	174 (92.1%)
Closure with hemoclips
Yes	129	1 (0.8%)	128 (99.2%)	<0.05
No	269	18 (6.7%)	251 (93.3%)

N.S.: not significant