Table 1.

Baseline characteristics of the whole population

	Group			Total
	< 60 years	60–64 years	> 64 years
Median age, years (range)	47	62	67	51 (23–80)
n (%)	3,516 (73.6)	753 (15.8)	506 (10.6)	4,775
ECOG (valid %)
0	87.9	74.4	73.1	84.2
1	11.9	25.6	26.1	15.5
2	0.2	0.0	0.8	0.3
3	0.0	0.0	0.0	0.0
Hormone receptor status (%)
Positive	62.9	70.9	67.0	64.6
Negative	27.2	21.9	26.3	26.3
Unknown	9.8	7.2	6.7	9.1
Tumor grading (valid %)
1	4.7	5.0	5.9	4.9
2	54.9	55.1	57.5	55.2
3	40.4	39.9	36.6	39.9
Pathology (valid %)
Ductal invasive	76.8	70.6	73.7	75.5
Lobular invasive	15.6	20.3	17.4	16.5
Others	7.6	9.1	8.8	8.0
Tumor size (valid %)
1	14.3	14.2	16.6	14.6
2	66.1	63.0	59.2	64.9
3	13.9	14.2	12.8	13.9
4	5.6	8.5	11.4	6.7
Nodal status (valid %)
pN positive	31.5	37.2	39.2	33.2
pN negative	0.1	0.0	0.0	0.0
cN positive	31.7	26.7	24.7	30.1
cN negative	36.8	36.1	36.0	36.6
Her2 status (%)
Positive	20.4	18.9	17.0	19.8
Negative	48.6	50.6	52.0	49.3
Unknown	31.0	30.5	31.0	30.9

ECOG = Eastern Cooperative Oncology Group

valid % = exclusion of the missing values.