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Table 1 Characteristics of 368 postmenopausal women recruited during annual screening mammogram at the Joanne Knight Breast Health Center, Washington University School of Medicine, St. Louis, MO

From: Hormone and receptor activator of NF-κB (RANK) pathway gene expression in plasma and mammographic breast density in postmenopausal women

Characteristic

Number

Mean ± SD/percentagesa

Age (years)

368

57.9 ± 3.8

Age at menarche (years)

361

12.8 ± 1.7

Body mass index (kg/m2)

367

31.3 ± 7.7

Race/ethnicity

  

 Non-Hispanic White

228

62.0

 Black or African-American

131

35.6

 Other

9

2.4

Education

  

 High school or less than high school

64

17.4

 Post high school training or some college

106

28.8

 College graduate

106

28.8

 Postgraduate

90

24.5

 Missing

2

0.5

Alcohol use

  

 No

149

40.5

 Yes

217

59.0

 Missing

2

0.5

Family breast cancer history

  

 No

271

73.6

 Yes

91

24.7

 Missing

6

1.6

Parity and age at first birth

  

 Nulliparous

63

17.1

 1–2 children, < 25 years

86

23.4

 1–2 children, 25–29 years

64

17.4

 1–2 children, ≥ 30 years

55

15.0

 ≥ 3 children, < 25 years

66

17.9

 ≥ 3 children, ≥ 25 years

33

9.0

 Missing

1

0.3

Breast feeding

  

 No

139

37.8

 Yes

164

44.6

 Not applicable

64

17.4

 Missing

1

0.3

Menopausal hormone therapy use

  

 No

245

66.6

 Yes

122

33.2

 Missing

1

0.3

Mammographic breast density

  

 Volumetric percent density (%)

368

6.2 ± 4.1

  VPD < 3.5%

52

 

  VPD ≥ 3.5% and < 7.5%

234

 

  VPD ≥ 7.5% and < 15.5%

68

 

  VPD ≥ 15.5%

14

 

 Dense Volume (cm3)

368

121.2 ± 125.1

 Non-dense Volume (cm3)

368

2134.4 ± 2062.6

  1. aMean ± Standard deviation (SD) presented for continuous variables. Percentages presented for categorical variable