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