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

Table 4 Comparison of changes in the function of gastric mucosa between the two groups

Group	n	PG I		PG II		PG I/II
		Before the operation	Before the discharge	Before the operation	Before the discharge	Before the operation	Before the discharge
Experimental group	39	65.31 ± 12.32	95.36 ± 19. 26a	23. 28 ± 2.51	14.20 ± 2.35a	2.72 ± 0.31	5.97 ± 1.52
Control group	39	66.38 ± 12. 48	75.42 ± 13.48a	24.03 ± 3.04	18.05 ± 1.03a	2.71 ± 0.29	4.76 ± 1.21
t value		0.359	153.313	0.728	6.706	0.000	12.832
P value		0.501	0.001	0.342	0.001	1.000	0.001

^aP < 0.05 vs those before the operation.

PG: Pepsinogen.