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

Table 1 Single-factor analysis of endoscopic submucosal dissection operation time

Factors	n	Operation time (min) (mean ± SD)	r/t/F	P value
Age (yr)	520	66.78 ± 40.89	0. 191	0.812
Sex			0.311	0.764
Male	367	64.19 ± 41.21
Female	153	73.38 ± 35.82
Underlying diseases			0.921	0.146
None	379	63.11 ± 27.17
Hypertension	126	70.91 ± 32.19
Diabetes	12	67.24 ± 41.65
Cirrhosis	3	78.55 ± 30.52
History of taking anticoagulant or antiplatelet drugs			1.260	0.262
Yes	31	59.51 ± 48.44
No	489	66.12 ± 20.38
Lesion location			1.333	0.198
Upper gastric body	112	75.76 ± 31.76
Middle gastric body	70	63.36 ± 38.91
Lower gastric body	338	65.54 ± 39.18
Maximum diameter of lesion			8.691	< 0.001
< 3.00 cm	351	52.22 ± 29.81
≥ 3.00 cm	169	90.38 ± 40.21
Lesion form			11.123	< 0.001
Uplift type	134	48.54 ± 28.11
Flat type	138	53.66 ± 31.81
Concave type	91	71.17 ± 33.71
Mixed type	157	109.33 ± 40.28
Combined ulcer or scar			7.288	0.001
Yes	64	93.17 ± 37.34
No	456	62.36 ± 31.97
Combined perforation			9.327	< 0.001
Yes	21	121.33 ± 41.19
No	499	63.17 ± 36.85
Infiltrative depth			5.442	0.017
Mucosa	397	55.44 ± 36.18
Submucosa	123	87.23 ± 39.67