Long-Term Clinical Efficacy and Perioperative Safety of Endoscopic Submucosal Dissection versus Endoscopic Mucosal Resection for Early Gastric Cancer: An Updated Meta-Analysis

Table 1

The characteristics of all the included studies.

Author	Year	Country	Study type	Group	Patients Number	Study quality
Tanabe et al. [5]	2014	Japan	Retro	EMR	359	5
				ESD	421
Okada et al. [6]	2012	Korea	Retro	EMR	45	5
				ESD	31
Ahn et al. [7]	2011	Korea	Retro	EMR	537	5
				ESD	833
Park et al. [8]	2010	Korea	Retro	EMR	50	5
				ESD	189
Watanabe et al. [9]	2006	Japan	Retro	EMR	146	7
				ESD	219
Shimura et al. [10]	2007	Japan	Retro	EMR	22	5
				ESD	40
Nakamoto et al. [11]	2009	Japan	Retro	EMR	80	5
				ESD	122
Catalano et al. [12]	2009	Italy	Retro	EMR	36	7
				ESD	12
Min et al. [13]	2009	Korea	Retro	EMR	103	7
				ESD	243
Hoteya et al. [14]	2009	Japan	Retro	EMR	328	7
				ESD	572
Shimura et al. [10]	2007	Japan	Retro	EMR	48	9
				ESD	59
Hoteya et al. [15]	2007	Japan	Retro	EMR	350	7
				ESD	304
Oda et al. [16]	2006	Japan	Retro	EMR	411	7
				ESD	303
Oka et al. [17]	2006	Japan	Retro	EMR	825	9
				ESD	195
Choi et al. [18]	2006	Japan	Retro	EMR	33	7
				ESD	33
Watanabe et al. [9]	2006	Japan	Retro	EMR	125	7
				ESD	120
Odashima et al. [19]	2006	Japan	Retro	EMR	80	7
				ESD	57
Yokoi et al. [20]	2006	Japan	Retro	EMR	18	7
				ESD	46

EMR = endoscopic mucosal resection, ESD = endoscopic submucosal dissection, and the Newcastle-Ottawa System: the quality of the nonrandomized studies was assessed by using this system, and the quality of the studies was evaluated by examining three items: patient selection, comparability of groups, and assessment of outcome.