Table 1.

The total patient numbers, patient distributions of the two binary prediction outcomes, and the train-test cross-validation methods of the screened patient cohort of the four public datasets.

Dataset name	Total patient No.	Distant metastasis		Local-/regional- recurrence		Cross-validation method
		Event	Non-event	Event	Non-event
HN1	137	8	129	34	103	Stratified 2-fold, 30 repetitions
HN-PETCT	298	40	258	43	255	Stratified 3-fold, 20 repetitions
HNSCC	460	39	421	65	395	Stratified 4-fold, 15 repetitions
OPC	524	74	450	73	451	Stratified 4-fold, 15 reptations