Endoscopic submucosal dissection for esophageal precancerous lesions and early esophageal carcinoma: Analysis of efficacy and serum tumor markers

Table 3 Comparative analysis of complications, n (%)

Indicators	Control group (n = 60)	Research group (n = 60)	χ2 value	P value
Delayed bleeding	3 (5.00)	2 (3.33)	0.209	0.648
Wound infection	9 (15.00)	0 (0.00)	9.730	0.002
Esophageal reflux	19 (31.67)	4 (6.67)	12.102	< 0.001
Postoperative esophageal stenosis	9 (15.00)	4 (6.67)	2.157	0.142
Total	40 (66.67)	10 (16.67)	30.857	< 0.001