Table 1 Demographic, anthropometric and lifestyle characteristics of participants across case and control groups

Age, y

48.91(10.46)

47.13(10.08)

0.062

BMI ^b, kg/m²

29.61(4.55)

29.07(5.39)

0.222

Waist- circumference (cm)

101.15(96.39)

96.39(13.25)

<0.001

Physical Activity (Met.h/wk)

33.18(6.11)

32.70(5.20)

0.336

HBI^c score

57.50 (8.25)

61.37(7.12)

<0.001

Smoking (yes), n (%)

(3.2)8

(3.4)9

0.894

Marriage age, y

19.43(5.02)

18.98(4.48)

0.296

First pregnancy age, y

22.29(5.32)

20.35(4.19)

<0.001

Child number

2.92(1.43)

2.54(1.59)

0.005

Abortion history (yes), n (%)

(37.2)94

(29.2)78

0.049

Family history of breast cancer (yes), n (%)

(5.5)14

(4.5)12

0.594

Family history of cancer (yes), n (%)

(26.9)68

(20.7)55

0.097

Benign breast diseases history (yes), n (%)

(7.9) 20

(5.3)14

0.224

Inflammatory disease history (yes), n (%)

(12.6)32

(13.2)35

0.863

Hormone replacement therapy (yes), n (%)

13(5.1)

25(10.9)

0.016

Vitamin D supplement (yes), n (%)

(14.6)37

(24.3)65

0.005

Ever use of OCP (yes), n (%)

(49.8)126

(56)149

0.156

Non-steroidal anti-inflammatory drugs (NSAIDs) drugs use (yes), n (%)

(10.3)26

(17.7)47

0.015

Education status, n (%)

0.518

Illiterate

(11.6)29

(9)24

Low education

(46.6)116

(50.4)134

Higher education

(42)105

(40.6)108

Exposure to sunlight during the day (min)

0.215

Less than 30 min

(28.5)72

(36)96

60–30 min

(32.4)82

(25.5)68

120–60 min

(17)43

(17.2)46

More than 120 min

(22.1)56

(21.3)57