Table 1.

Baseline characteristics.

Characteristics	Development data set	Test data set
No. of images	32,208	11,481
No. of endoscopists	33	13
No. of patients	1768	397
Age, mean (SD), y	52.7 (13.2)a	50.4 (11.2)
Sex, No. (%)
Male	480 (45)a	168 (43)
Female	598 (55)a	226 (57)
H. pylori status, No. (%)
Positive	753 (43)	72 (18)
Negative	1015 (57)	325 (82)

SD, standard deviation.

^aData were available for 1078 cases.