Construction and analysis of an ulcer risk prediction model after endoscopic submucosal dissection for early gastric cancer

Table 2 Comparison of pathological features of ulcer group and non-ulcer group, n (%)

Pathological features	Ulcer group (n = 40)	Non-ulcer group (n = 156)	t/χ2 value	P value
Lesion diameter (cm)	4.40 ± 0.97	2.97 ± 0.62	8.871	< 0.001
Number of tumors			4.185	0.041
Single shot	18 (45.00)	98 (62.83)
Multiple	22 (55.00)	58 (37.18)
Pathological type			0.268	0.605
Differentiated carcinoma	19 (47.50)	67 (42.95)
Undifferentiated carcinoma	21 (52.50)	89 (57.05)
Infiltration depth			3.988	0.046
Submucosa	21 (52.50)	55 (35.26)
Mucosal layer	19 (47.50)	101 (64.74)
Vascular invasion	2 (5.00)	6 (3.85)	0.108	0.742