Table 1: The characteristics of the patients and lesions and the endoscopic factors in the clipping and nonclipping groups.

TotalBleedingNo bleeding value

Numbers of lesions in male and female patientsMale2086202N.S.
Female80179

Age (mean ± SE)67.4 ± 1062.4 ± 1367.5 ± 10N.S.

Anticoagulant drugs+808N.S.
2807273

Antiplatelet drugs+38236N.S.
2505245

LocationRectum27126N.S.
Others2616255
Cecum19019
Ascending54153
Transvers70367
Descending25025
Sigmoid96294

MorphologyPedunculated41140N.S.
Sessile and flat2476241

Size (cm)<22745269
≥214212<0.01

PathologyAdenoma2735268N.S.
Carcinoma15213

MethodEMR2345229N.S.
Polypectomy54252

Exposed vessel+716N.S.
2816275

Length of procedure (mean ± SE)413 ± 463937 ± 1623396 ± 360<0.01

Specialists+1773174N.S.

Less-experienced endoscopists1114107

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