Table 1.

Cohort characteristics per group

n (%)	Experts	ESD trainees	P‐value
Number of ESDs, n (%)	272 (100)	318 (100)	NA
Male, n (%)	169 (62.1)	188 (59.1)	0.46
Age in years, average (SD)	67.8 (10.8)	67.8 (11.5)	0.97
Right colon location, n (%)	97 (35.7)	113 (35.5)	0.96
Rectum location, n (%)	87 (32.0)	114 (35.8)	0.33
Adenomas, n (%)	58 (21.3)	56 (17.6)	0.26
M adenocarcinomas, n (%)	149 (54.8)	176 (55.3)	0.90
Superficial adenocarcinomas†, n (%)	29 (14.9)	25 (11.5)	0.22
Invasive adenocarcinomas†, n (%)	16 (8.2)	17 (7.8)	0.86
Carcinoid, n (%)*	3 (1.1)	12 (3.8)	0.04
Other, n (%)	17 (6.3)	32 (10.1)	0.10

^* P < 0.05.

^† Threshold of 1000 micrometers into the submucosa.

N/A, not applicable; ESD, endoscopic submucosal dissection.