Associate factors for endoscopic submucosal dissection operation time and postoperative delayed hemorrhage of early gastric cancer

Table 3 Single-factor analysis of the bleeding group and non-bleeding group

Factors	Bleeding group (n = 43)	Non-bleeding (n = 477)	χ2 value	P value
Age (yr)			0.120	0.729
< 60	23	242
≥ 60	20	235
Sex			0.015	0.903
Male	30	337
Female	13	140
Underlying diseases
Hypertension	16	110	4.301	0.038
Diabetes	2	10	1.142	0.285
Cirrhosis	0	3	-	-
History of taking anticoagulant or antiplatelet drugs			59.148	< 0.001
Yes	14	17
No	29	460
Lesion location			0.489	0.783
Upper gastric body	10	102
Middle gastric body	7	63
Lower gastric body	26	312
Maximum diameter of lesion			29.677	< 0.001
< 3.00 cm	13	338
≥ 3.00 cm	30	139
Lesion form			11.098	0.011
Uplift type	7	127
Flat type	12	126
Concave type	15	76
Mixed type	9	148
Combined ulcer or scar			0.020	0.887
Yes	5	59
No	38	418
Combined perforation			1.044	0.307
Yes	3	18
No	40	459
Infiltrative depth			3.274	0.070
Mucosa	28	369
Submucosa	15	108
ESD operation time			6.979	0.008
< 60 min	16	277
≥ 60 min	27	200

ESD: Endoscopic submucosal dissection.