Table 2 Characteristics and reproductive factors of BC patients by molecular subtypes

Age at diagnosis (years)^a

48.78 ± 12.19

39.73 ± 6.40

41.76 ± 9.14

44.49 ± 10.81

Histological type, n (%)^b

IDC-NST

105 (89.7)

55 (93.2)

26 (89.7)

46 (79.3)

ILC

3 (2.6)

0 (0)

1 (3.4)

9 (15.5)

MC

2 (1.7)

2 (3.4)

1 (3.4)

0 (0)

Others

7 (6)

2 (3.4)

1 (3.4)

3 (5.2)

TNM pathological stage, n (%)^b

I

1 (0.9)

0 (0)

2 (6.9)

1 (1.7)

II

24 (20.5)

4 (6.8)

2 (6.9)

11 (19)

III

64 (54.7)

33 (55.9)

15 (51.7)

34 (58.6)

IV

28 (23.9)

22 (37.3)

10 (34.5)

12 (20.7)

Tumor laterality, n (%)^b

Left

60 (51.3)

31 (52.5)

11(37.9)

25 (43.1)

Right

53 (45.3)

27 (45.8)

18 (62.1)

29 (50)

Bilateral

4 (3.4)

1 (1.7)

0 (0)

4 (6.9)

Menopausal status, n (%)^b

Pre-menopause

38 (32.5)

41 (69.5)

16 (55.2)

24 (39.1)

Post-menopause

79 (67.5)

18 (30.5)

13 (44.8)

34 (60.9)

Family history of BC, n (%)^b

Yes

25 (21.4)

12 (20.3)

4 (13.8)

14 (24.1)

No

92 (78.6)

47 (79.7)

25 (86.2)

44 (75.9)

Menarche, n (%)^b

Early < 12 years old

5 (4.3)

3 (5.1)

2 (6.9)

1 (1.7)

Normal 13–14 years old

54 (46.1)

27 (45.7)

10 (34.5)

24 (41.4)

Late > 15 years old

58 (49.6)

9 (49.2)

17 (58.6)

33 (56.9)

Age at first full-term pregnancy, n (%)^b

< 30 years old

75 (74.8)

46 (86.8)

21 (79.3)

43 (87.8)

≥ 30 years old

25 (25.2)

9 (13.2)

6 (20.7)

10 (12.2)

Parity, n (%)^b

Nulliparous

17 (13.7)

4 (6.8)

2 (6.9)

5 (10.3)

1–2 Children

35 (30.8)

26 (44.1)

7 (24.1)

20 (33.8)

≥ 3 Children

65 (55.6)

29 (49.2)

20 (69)

33 (55.9)

Breast-feeding, n (%)^b

Yes

96 (82.1)

40 (67.8)

22 (75.9)

38 (65.5)

No

21 (17.9)

19 (32.2)

7 (24.1)

20 (25.5)

Breast-feeding duration, n (%)^b

< 15 months

19 (19.8)

10 (25)

6 (27.3)

12 (31.6)

≥ 15 months

77 (80.2)

30 (75)

16 (72.7)

26 (68.4)