Table 1 Characteristics of case and controls

Age

18–29

12(12.5)

9(17.6)

30–39

25(26.0)

22(25.9)

40–49

37(38.5)

37(43.5)

50–59

14(14.6)

13(15.3)

60–69

4(4.17)

3(3.53)

70–79

4(4.17)

1(1.18)

Mean age (SD)

47.83(±10.9)

45.22(±11.8)

0.37

Drinking habit

Never

83(89.6)

81(95.3)

Former^a

6(6.25)

0(0)

Current

4(4.17)

1(1.18)

Moderate^b

2(2.08)

1(1.18)

0.21

Heavy^c

1(1.04)

0(0)

Unknown

0(0)

3(3.53)

Somking habit

Never

76(79.2)

85(100)

<0.01

Former^a

14(14.6)

0(0)

<0.01

Current (pack years)

6(6.25)

0(0)

0–19

2(2.08)

0(0)

≥20

3(3.12)

0(0)

Unknown

1(1.04)

0

BMI

<18.5

9(9.38)

7(8.24)

18.5–24.9

30(31.3)

26(30.6)

≥25.0

53(55.2)

50(58.8)

Unknown

4(4.17)

2(2.35)

0.87

Regular exercise

Yes

62(64.6)

63(74.1)

No

29(30.2)

21(21.9)

Unknown

5(5.21)

1(1.04)

0.11

Family history of breast cancer

Yes

0(0)

0(0)

No

96(100)

85(100)

Unknown

0(100)

0(100)

1.00

Menopausal status

Premenopausal

69(71.9)

64(75.3)

Postmenopausal

27(28.1)

21(24.7)

0.74

Age at menarche

≤12

24(25)

19(22.4)

13–14

66(68.8)

60(70.6)

≥15

2(2.08)

44.70)

Unknown

4(4.16)

2(2.35)

0.82

Age at menopause

≤47

4(4.17)

2(2.35)

48–52

13(13.5)

10(11.8)

≥53

9(9.38)

7(8.24)

Unknown

1(1.04)

2(2.35)

0.91

Others

2(2.08)

1(1.17)

0.21