A Randomized Study on the Effectiveness of Prophylactic Clipping during Endoscopic Resection of Colon Polyps for the Prevention of Delayed Bleeding

Table 2

The characteristics of the patients and lesions and the endoscopic resection-associated factors in the clipping and nonclipping groups.

		Clipping	Nonclipping	value
Numbers of lesions in male and female patients	Male	109	99	N.S.
	Female	45	35
Age (mean SE)		67.1 ± 8	67.8 11	N.S.
Location	Rectum	11	16	N.S.
	Others	143	118
Morphology	Pedunculated	28	13	N.S.
	Sessile and flat	127	122
Size (cm)	<1	98	86	N.S.
	1, <2	48	42	N.S.
	2	8	6	N.S.
Anticoagulant drugs	+	6	2	N.S.
	−	148	132
Antiplatelet drugs	+	19	19	N.S.
	−	135	115
Treatment method	EMR	131	103	N.S.
	Polypectomy	23	31
Exposed vessel	+	5	2	N.S.
	−	149	132
Length of procedure; (second; mean SE)		528 559	281 263	<0.01
Specialists; Less-experienced endoscopists	+	87	90	N.S.
	−	68	43
Bleeding	+	4	3	N.S.
	−	150	131

N.S.: not significant.
EMR: endoscopic mucosal resection.
Exposed vessel: obvious vessels in the ulceration after endoscopic resection.