Table 4. Subgroup analyses by the type of intervention and region of patients.

Analysis	Studies,N	ER, N	Gastrectomy,N	OR, 95%CI	P value for association	P value for heterogeneity	I 2
Type of intervention:
EMR	2	221	423	0.22(0.01, 5.97)	0.90	0.02	81%
ESD	3	232	133	0.27(0.10, 0.69)	0.007	0.11	54%
Region of patients:
Asia	5	602	826	0.31(0.14, 0.69)	0.004	0.01	69%
Beyond Asia	1	16	22	0.89(0.20, 3.87)	NA	NA	NA

ER, endoscopic resection;

NA, not available.