Efficacy and safety of endoscopic submucosal dissection for early gastric cancer and precancerous lesions in elderly patients

Table 1 Comparison of general intraoperative information between the two groups

Group	n	En bloc resection	Curative resection	Rate of residual tumors at the base of the primary tumors	Intraoperative blood loss in mL	Operation time in min
Experimental group	39	38 (97.44)	29 (74.36)	1 (2.56)	102.21 ± 9.31	85.32 ± 8.93
Control group	39	28 (71.79)	20 (51.28)	11 (28.21)	76.53 ± 7.83	68.22 ± 7.34
χ2/t value		12.733	10.721	17.412	6.426	5.315
P value		0.001	0.001	0.001	0.001	0.001

Data are n (%).