Endoscopic mucosal resection vs endoscopic submucosal dissection for superficial non-ampullary duodenal tumors

Table 2 Comparison of clinicopathological characteristics of the endoscopic mucosal resection and endoscopic submucosal dissection groups after propensity score matching

	EMR group, n = 28	ESD group, n = 28	P value	ASD
Variable matching between groups
Age, yr; ≥ 65/< 65	8/20	6/22	0.76	0.17
Sex; male/female	17/11	16/12	1	0.073
Tumor location; bulbs/others	8/20	6/22	0.67	0.17
Morphology; protruded/flat or depressed	22/6	23/5	1	0.090
Histology; adenocarcinoma/adenoma	8/20	7/21	1	0.081
Tumor depth; mucosa/submucosa	27/1	27/1	1	0
Tumor size; median (IQR)	11 (6.25-15)	10.5 (8-13)	0.90	0.026
Tumor size; ≥ 11 mm/< 11 mm	14/14	14/14	1	0

P values were calculated using the Fisher exact test for categorical data and the Mann-Whitney U test for continuous data. EMR: Endoscopic mucosal resection; ESD: Endoscopic submucosal dissection; ASD: Absolute standardized difference; IQR: Interquartile range.