Table 1.

Composition of the training, validation, and test dataset

Institution		Training set	Validation set	Test set	Sum
	Seoul National University Dental Hospital	1,292	100	52	1,444
	Kyung Hee University Dental Hospital	607	100	48	755
	Kyungpook National University Dental Hospital	133	30	20	183
	Asan Medical Center	144	32	24	200
	Ewha University Medical Center	116	20	12	148
	Wonkwang University Dental Hospital	95	26	8	129
	Ajou University Dental Hospital	84	20	12	116
	Korea University Anam Hospital	62	25	0	87
	Chonnam National University Dental Hospital	48	16	8	72
	Chosun University Dental Hospital	45	9	0	54
Total	Lateral cephalograms	2,626	378	184	3,188
	Class III patients	751*		46	797

*Class III patients had various numbers of lateral cephalograms, which belonged to the training or validation set.