Table 1 General characteristics of breast cancer patients in the study (N = 177)

Age at diagnosis

 Mean ± SD

46.67 ± 9.03

 < 46

99

56.3

 ≥ 46

77

43.8

0.097

Menopausal status

 Premenopausal

116

65.5

 Postmenopausal

61

34.5

< 0.001

Estrogen receptor

 Positive

131

86.2

 Negative

21

13.8

< 0.001

Progesterone receptor

 Positive

128

84.8

 Negative

23

15.2

< 0.001

Human epidermal growth factor receptor 2

 Positive

27

18.1

 Negative

122

81.9

< 0.001

Vascular invasion

 Positive

94

81

 Negative

22

19

< 0.001

Axillary lymph node metastasis

 Positive

99

64.3

 Negative

55

35.7

< 0.001

Grade

 I

24

16.4

 II

107

73.3

 III

15

10.3

< 0.001

BMI at diagnosis

 Normal

26

16

 Overweight

79

48.5

 Obese

58

35.6

< 0.001

Oral contraceptive use

 Yes

40

22.7

 No

136

77.3

< 0.001