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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