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

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

  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
  1. 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
  2. p value was calculated using Fisher’s exact test for categorical data
  3. p value was calculated using the t test for continuous data