Comparison of a portable disposable large-channel gastroscope and a conventional reusable gastroscope in gastric endoscopic submucosal dissection

Table 1 Assessment of gastroscopy performance and endoscopic image quality, mean ± SD

	Experimental group (n = 10)1	Control group (n = 10)2	P value
Duration of gastroscopy	287.33 ± 38.15	284.78 ± 70.75	0.673
Image integrity scores	30.80 ± 0.42	30.90 ± 0.32	0.739
Image sharpness scores	30.50 ± 0.71	30.80 ± 0.42	0.436
Image contrast scores	30.10 ± 1.20	30.80 ± 0.42	0.218
Image brightness scores	29.67 ± 1.23	30.67 ± 0.50	0.203

¹Portable disposable large-channel gastroscope.

²Conventional reusable gastroscopes.

Table 2 Comparison of the operational performance scores between the portable disposable large-channel gastroscope (experimental group) and conventional reusable gastroscopes (control group)

Operational performance	Score	Experimental group	Control group	P value
Image acquisition	0	0	0
	1	0	0
	2	0	0
	3	0	0
	4	20	20
Water supply	0	0	0	0.602
	1	0	0
	2	0	0
	3	3	1
	4	17	19
Air supply	0	0	0	0.602
	1	0	0
	2	0	0
	3	2	0
	4	18	20
Suction	0	0	0	0.289
	1	0	0
	2	0	0
	3	0	4
	4	20	16
Large-knob operation	0	0	0	0.602
	1	0	0
	2	0	0
	3	2	0
	4	18	20
Small-knob operation	0	0	0	0.108
	1	0	0
	2	1	0
	3	5	0
	4	14	20
Body rigidity	0	0	0	0.183
	1	0	0
	2	0	0
	3	5	0
	4	15	20
Field of view	0	0	0
	1	0	0
	2	0	0
	3	0	0
	4	20	20
Light illumination	0	0	0	0.183
	1	0	0
	2	0	0
	3	0	5
	4	20	15
Tip flexibility	0	0	0
	1	0	0
	2	0	0
	3	0	0
	4	20	20
Working channel	0	0	0
	1	0	0
	2	0	0
	3	0	0
	4	20	20

Table 3 Comparison of the performance between portable disposable large-channel gastroscope (experimental group) and reusable gastroscopes (control group) in endoscopic submucosal dissection, median (25^th-75^th percentiles)

	Experimental group	Control group	P value
En bloc resection rate (%, n/n)	100% (20/20)	100% (20/20)	-
Submucosal dissection time (minutes)	9.92 (8.19, 16.30)	11.21 (9.06, 13.25)	0.864
Total procedure time of endoscopic submucosal dissection, minutes	18.00 (12.11, 23.80)	17.99 (14.82, 20.51)	0.938
Total submucosal injection volume (mL)	20.50 (11.50, 39.00)	20.50 (14.00, 23.00)	0.767
Specimen size, mm	20.35 (16.45, 24.43)	18.72 (17.04, 21.12)	0.501
Muscle layer injury	-	-	-
Complications	-	-	-