Table 1.

Colorectal polyp segmentations in the training set and external test set class-divided according to the histopathological report

Histopathologic category	Number of polyp segmentations		Classification
	Training set	External test set
Regular mucosa	3/169 (2%)	9/118 (8%)	Benign
Hyperplastic polyp	78/169 (46%)	30/118 (25%)
Lipomatous polyp	2/169 (1%)	0/118 (0%)
Tubular adenoma	57/169 (34%)	49/118 (42%)	Premalignant
Tubulovillous adenoma	16/169 (9%)	26/118 (22%)
Villous adenoma	8/169 (5%)	0/118 (0%)
Serrated adenoma	4/169 (2%)	0/118 (0%)
Adenocarcinoma	1/169 (1%)	4/118 (3%)

The adenocarcinoma segmentations were included in the premalignant group for study purposes only