Splash M-knife versus Flush Knife BT in the technical outcomes of endoscopic submucosal dissection for early gastric cancer: a propensity score matching analysis

Table 3 Matching factors between the Splash M-knife and control groups after propensity score matching

	ESD-M n = 45	ESD-F n = 45	p value	ASD
Variable matching between groups
Age, y; mean ± SD	73.5 ± 8.68	73.0 ± 8.95	0.802^¶	0.0454
Gender; Male/Female	27/18	25/20	0.831^‡	0.0464
Underlying disease; No/Yes	41/4	41/4	1^‡	0
Antithrombotic drugs; No/Yes	44/1	44/1	1^‡	0
Tumor size, mm mean ± SD	17.0 ± 9.46	16.8 ± 12.2	0.923^¶	0.0183
Location of lesions; Upper or Middle/Lower	26/19	26/19	1^‡	0
Position of lesions; Lesser curvature/others	19/26	18/27	1^‡	0.0908
Macroscopic type; Flat or depressed/ protruding	27/18	29/16	0.828^‡	0.0918
Presence of ulceration	4	4	1^‡	0
Operator level; expert/trainee	22/23	22/23	1^‡	0
Electrosurgical unit; VIO 300D/ICC 200	40/5	40/5	1^‡	0

ESD-M endoscopic submucosal dissection with Splash M-knife, ESD-F endoscopic submucosal dissection with Flush Knife BT, SD standard deviation, ASD absolute standardized difference
p value was calculated using Fisher’s exact test ^‡ for categorical data
p value was calculated using the t test ^¶ for continuous data

ISSN: 1471-230X