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 |