Table 1.
Characteristics of 367 postmenopausal women recruited during annual screening mammogram at the Joanne Knight Breast Health Center, Washington University School of Medicine, St. Louis, MO
| Characteristics | N | Mean ± SD/ Percentage (%) |
|---|---|---|
| Age at mammogram (years) | 367 | 57.94 ± 3.82 |
| Age at menarche (years) a | 361 | 12.76 ± 1.70 |
| Parity and age at first birth b | ||
| Nulliparous | 63 | 17.17% |
| 1-2 children, < 25 years | 84 | 22.89% |
| 1-2 children, 25-29 years | 63 | 17.17% |
| 1-2 children, ≥ 30 years | 57 | 15.53% |
| ≥ 3 children, < 25 years | 63 | 17.17% |
| ≥ 3 children, ≥ 25 years | 33 | 8.99% |
| Ever breastfeed | 164 | 44.69% |
| Family history of breast cancer c | 91 | 24.80% |
| Ever used menopausal hormone therapy d | 122 | 33.24% |
| Race | ||
| Non-Hispanic White | 228 | 62.13% |
| African American | 130 | 35.42% |
| Others | 9 | 2.45% |
| Education e | ||
| High school or less than high school | 64 | 17.44% |
| Post high school training or some college | 106 | 28.88% |
| College graduate | 105 | 28.61% |
| Postgraduate | 90 | 24.52% |
| Current alcohol consumption f | 217 | 59.13% |
| Adiposity measures g | ||
| Body fat (%) h | 362 | 41.31 ± 8.64 |
| Hip circumference (cm) h | 365 | 110.09 ± 18.45 |
| Waist circumference (cm) h | 366 | 96.05 ± 18.39 |
| Height (cm) h | 367 | 163.51 ± 6.69 |
| BMI at age 10 years (kg/m2) i | 357 | 17.21 ± 2.99 |
| BMI at age 18 years (kg/m2) i | 367 | 21.80 ± 4.46 |
| BMI at age 30 years (kg/m2) i | 367 | 25.08 ± 5.90 |
| BMI at mammogram (kg/m2) i | 367 | 31.28 ± 7.70 |
| Weight at age 18 years (kg) | 367 | 58.05 ± 10.91 |
| Weight at age 30 years (kg) | 367 | 66.72 ± 14.43 |
| Weight at mammogram (kg) | 367 | 83.53 ± 20.55 |
| Mammographic density | ||
| Volumetric percent density (%) | 367 | 6.22 ± 4.15 |
| Dense volume (cm3) | 367 | 121.36 ± 125.22 |
| Non-dense volume (cm3) | 367 | 2136.76 ± 2064.92 |
Six women had missing information for age at menarche.
Four women had missing information for parity and age at first birth.
Six women had missing information for family history of breast cancer.
One woman had missing information for ever use of menopausal hormone therapy.
Two women had missing information for education.
Two women had missing information for current alcohol consumption.
Five women had missing information for body fat, two women had missing information for hip circumference, one woman had missing information for waist circumference, ten women had missing information for BMI at age 10.
Adiposity measures at the time of mammogram.
Body mass index (BMI) was calculated as weight (kg) at each age divided by height squared (m2).