Table 1.

Summary of patient demographics and clinical characteristics.

Characteristics	Groups	Patients
		Total (N = 722)		Training set (N = 367)		Testing set (N = 355)
		No.	%	No.	%	No.	%
Age at diagnosis
	Median	65.3		64.4		63.7
	Range	21.0–97.0		31.0–90.0		21.0–94.0
	<65 years	354	49.0	172	46.9	182	51.3
	≥65 years	368	51.0	195	53.1	173	48.7
Gender
	Male	394	54.6	199	54.2	195	54.9
	Female	328	45.4	168	45.8	160	45.1
TNM stage
	I	86	11.9	55	15.0	31	8.7
	II	216	29.9	141	38.4	75	21.1
	III	208	28.8	117	31.9	91	25.6
	IV	212	29.4	54	14.7	158	44.5
Vital status
	Living	458	63.4	287	78.2	171	48.2
	Dead	264	36.6	80	21.8	184	51.8