Table 1.

Clinical covariates for included patients.

Covariate		Total set n = 349	Training set n = 174	Testing set n = 175	P-value#
Age, n	≥65	202	97	105	P = 0.421
	<65	147	77	70
Gender	Male	134	67	67	P = 0.966
	Female	215	107	108
Pathological stage, n	I + II	156	77	79	P = 0.867
	III + IV	193	97	96

^#x²-test.