Table 1.

Demographic characteristics of 1035 breast cancer patients.

Characteristic	Training	Test	Entire
	Set (n = 518)	Set (n = 517)	Set (n = 1035)
Age (years)
Mean	58.3	58.13	58.21
<50	143	144	287
≥50	375	373	748
Clinical stage
I	86	87	173
II	307	291	598
III	113	127	240
IV	12	12	24
T stage
T1	136	133	269
T2	304	298	602
T3	62	66	128
T4	16	20	36
N stage
N0	237	247	484
N1	185	166	351
N2	67	56	123
N3	29	48	77
M stage
M0	506	505	1011
M1	12	12	24
Vital status
Living	437	454	891
Dead	81	63	144
OS time (years)
Mean	17.99	18.52	18.26
Range	0-20.42	0-20.42	0-20.42

Age: the age of patient at diagnosis; OS time: overall survival time.