Ex vivo porcine model study on the treatment outcomes of scissor-type knife versus needle-type knife in endoscopic submucosal dissection performed by trainees

Table 2 Characteristics and treatment outcomes of ESD between the two groups in S-Trainee

	ESD-S (n = 8)	ESD-N (n = 8	P value
Tumor location (n)
Upper/middle/lower	0/4/4	0/3/5	1.0
Anterior wall/posterior wall/lesser curvature/greater curvature	3/1/1/3	2/2/2/2	0.26
Specimen size, mm (range)	37.5 (28–53)	33.5 (25–53)	0.52
Median procedure time, min (range)
Total	18.0 (9–27)	17.8 (7–31)	0.75
Mucosal incision	12.0 (5.5–20)	13.0 (4.5–17)	0.79
Submucosal dissection	6.5 (1.5–10)	4.8 (2.5–14)	0.29
Self-completion, n (%)	8 (100%)	7 (87.5%)	0.12
En-bloc resection, n (%)	8 (100%)	8 (100%)	1.0
Complication, n (%)	0 (0%)	0 (0%)	1.0
Perforation, n (%)	0 (0%)	0 (0%)	1.0
Muscularis layer injury, n (%)	0 (0%)	0 (0%)	1.0

P value was calculated using χ² test or Fisher’s exact test for categorical data
P value was calculated using Mann–Whitney U test for continuous data
ESD endoscopic submucosal dissection, S-Trainee senior-trainee with the experience of over 1000 endoscopies, ESD-S endoscopic submucosal dissection with scissor-type knife, ESD-N endoscopic submucosal dissection with needle-type knife

ISSN: 1471-2482