Table 1.

Clinical features of patients in the training set and validation set

	Training set		p	Validation set		p
	Metastasis	Non-metastasis		Metastasis	Non-metastasis
Age			0.41			0.56
Median	16	18		14.05	14.37
Gender			0.11			0.25
Female	9	10		12	25
Male	25	9		9	38
Grade			0.33	–	–	–
1	11	2
2	9	7
3	7	6
4	3	2