What can be the criteria of outpatient-based endoscopic resection for colon polyp?

Table 2 Comparison between the delayed bleeding group and the uneventful group n (%)

	Delayed bleeding n = 25	Uneventful group n = 2990	P value
Age, mean ± SD, yr	58.4 ± 10.1	59.6 ± 10.4	0.646
Male	15 (60.0)	1756 (58.7)	0.898
Laboratory before EMR
Hemoglobin, g/dL	13.2 ± 1.4	13.66 ± 1.8	0.187
Platelet, × 103 count/mm3	60.5 ± 12.1	71.9 ± 1.3	0.81
Prothrombin time, INR	0.984 ± 0.067	0.989 ± 0.528	0.785
Activated partial thromboplastin time, s	33.8 ± 4.4	34.9 ± 23.2	0.665
Comorbidity
Hypertension	5 (20.0)	559 (18.7)	0.800
Cardiovascular or cerebrovascular disease	5 (20.0)	384 (12.8)	0.362
Chronic renal failure	2 (8.0)	21 (0.7)	0.015
Liver cirrhosis	1 (4.0)	74 (2.5)	0.131
Diabetes mellitus	3 (12.0)	154 (5.1)	0.140
Cancer history	3 (12.0)	350 (11.7)	1.000
Anti-coagulants and anti-platelets
Aspirin	3 (12.0)	250 (8.4)	1.000
Clopidogrel	1 (4.0)	56 (1.9)	0.381
Warfarin	0 (0.0)	43 (1.4)	1.000
Size of lesion, mean ± SD, mm	25.8 ± 11.6	11.0 ± 6.6	< 0.001
Locations
Right side colon1	8 (32.0)	1288 (43.1)	0.314
Morphologic classification
Pedunculated	11 (44.0)	539 (18.0)	0.003
Piecemeal resection	6 (24.0)	124 (4.1)	0.001
Pathologic complete resection	25 (100.0)	2954 (79.9)	1.000
Horizontal margin involvement	0 (0.0)	31 (1.0)	1.000
Vertical margin involvement	0 (0.0)	10 (0.3)	1.000
Serious immediate bleeding2	3 (12.0)	75 (2.5)	0.025
Prophylactic hemostatic clipping	4 (16.0)	341 (11.4)	0.319
Histology
Adenoma	23 (92.0)	2337 (78.2)	0.140
Carcinoma	1 (4.0 )	88 (18.4)	0.529
Hyperplastic polyp	1 (4.0)	412 (13.8)	0.240
Others	0 (0.0)	90 (3.0)	1.000

¹Right side colon includes cecum, ascending colon and transverse colon;

²Serious immediate bleeding was defined as bleeding which required hemostatic clip application after EMR. EMR: Endoscopic mucosal resection.