Comparing outcomes for endoscopic submucosal dissection between Eastern and Western countries: A systematic review and meta-analysis

Table 1 Characteristics of the included studies and patients

	Total	Eastern countries	Western countries
Age (yr)1	66.4	66.4	66
Total number of patients (n)	84318	82183	2135
Total number of lesions (n)	89512	87296	2216
Esophagus	5597	5276	321
Stomach	59966	59173	793
Duodenum	15	8	7
Colorectum	23934	22839	1095
Lesion diameter (mm)1	26	25.7	34.1
Procedure time (min)1	78	77	110
Total number of studies	239	216	23
Randomized controlled trial	7	7	0
Prospective studies	61	53	11
Retrospective studies	168	156	12
Full-text	140	130	10
Abstract	99	86	13

¹Weighted average, with number of patients in study used as weights.