Analysis of risk factors for disease recurrence after endoscopic submucosal dissection of early esophageal cancer

Table 2 Clinical features of the recurrence group and the recurrence-free group, mean ± SD/n (%)

Characteristic	Recurrence group (n = 30)	Non-recurrence group (n = 180)	P value
Gender			0.068
Male	17 (56.67)	151 (83.89)
Female	13 (43.33)	29 (16.11)
Age (years)			0.473
≥ 65 years	11 (36.67)	73 (40.56)
< 65 years	19 (63.33)	107 (59.44)
Endoscopic ultrasound examination			0.262
Examined	16 (53.33)	131 (72.78)	0.713
Not examined	14 (46.67)	49 (27.22)
Tumor location
Upper third			0.173
Middle third	18 (60)	143 (79.44)
Lower third	12 (40)	37 (20.56)
Tumor size (cm)	2.56 ± 1.05	1.87 ± 0.79	< 0.001
Differentiation degree			< 0.001
Well differentiated	9 (30)	96 (53.33)
Moderately differentiated	7 (23.33)	70 (38.89)
Poorly differentiated	14 (46.67)	14 (7.78)
Invasion depth			< 0.001
Mucosal lamina propria	11 (36.67)	122 (67.78)
Muscularis mucosa	9 (30)	54 (30)
Submucosal layer	10 (33.33)	4 (2.22)
Complete tumor resection			< 0.001
Yes	19 (63.33)	169 (93.89)
No	11 (36.67)	11 (6.11)