TABLE 1.

Clinical features in the training set, testing set, and entire set.

Variable	Type	Entire set (n = 337)	Training set (n = 169)	Testing set (n = 168)	χ2	p value
Age	>65	181	89	92	0.625	0.745
	≤65	153	79	74
	unknown	3	1	2
Gender	Female	119	61	58	0.091	0.763
	Male	218	108	110
Grade	G1-2	129	70	59	1.694	0.432
	G3	199	94	105
	unknown	9	5	4
Stage	Stages I–II	152	75	77	0.315	0.854
	Stages III–IV	171	86	85
	unknown	14	8	6
T	T1-2	89	43	46	0.292	0.891
	T3-4	244	124	120
	unknown	4	2	2
M	M0	303	150	153	4.269	0.120
	M1	22	15	7
	unknown	12	4	8
N	N0	99	49	50	0.830	0.660
	N1-3	227	113	114
	unknown	11	7	4