Table 1.

Patient and lesion characteristics in the training and test datasets

Characteristics	Training dataset (n = 267)	Test dataset (n = 82)	P value
Male/female, n	205/62	58/24	0.27
Age, average (range), years	72.3 (35–92)	72.2 (52–87)	0.99
Tumor location, n, upper third/middle third/lower third	30/114/123	11/17/54	< 0.01
Tumor size, average (range), mm	15.8 (2–70)	13.5 (4–50)	< 0.05
Macroscopic types, n, 0‐I/0‐IIa/0‐IIb/0‐IIc/Type 0 mixed	6/88/10/144/19	0/19/3/52/8	0.46
Depth of tumor, n, T1a (mucosa)/T1b (submucosa)	230/37	69/13	0.65
Helicobacter pylori infection, n, positive/negative (eradication/uninfected)	102/143 (135/8)	21/53 (50/3)	< 0.05

0‐I, protruded; 0‐IIa, flatly elevated; 0‐IIb, flat; 0‐IIc, flatly depressed.