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

Table 1 Clinical data of patients with early-stage oesophageal cancer, mean ± SD

Characteristic	Esophageal cancer (n = 210)	Percentage (%)
Gender
Male	168	80
Female	42	20
Age (years)	62.53 ± 7.82
Elderly status
≥ 65 years	84	40
< 65 years	126	60
Endoscopic ultrasound examination
Examined	147	70
Not examined	63	30
Tumor location
Upper third	0	0
Middle third	161	76.67
Lower third	49	23.33
Tumor size (cm)	2.49 ± 1.25
Differentiation degree
Well differentiated	105	50
Moderately differentiated	77	36.67
Poorly differentiated	28	13.33
Invasion depth
Mucosal lamina propria	133	63.33
Muscularis mucosa	63	30
Submucosal layer	14	6.67