Characteristics of SIBS women that were included in this study (n = 1,286)
| Characteristic | Mean | SD |
|---|---|---|
| Age, y | 61.7 | 5.4 |
| Interval between the mammogram examination and blood sampling, mo | 7 | 7 |
| Percentage density, % | 15.0 | 11.9 |
| Dense area, cm2 | 67.0 | 58.8 |
| Nondense area, cm2 | 171.8 | 115.2 |
| Estradiol, pmol/La | 14.3 | 2.2 |
| Testosterone, nmol/La | 0.66 | 1.8 |
| SHBG, nmol/La | 49.4 | 1.6 |
| BMI, kg/m2 | 27.1 | 5.2 |
| WHR | 0.8 | 0.06 |
| Chest circumference under the bust, cm | 34.1 | 3.7 |
| Age at menarche, y | 12.8 | 1.6 |
| Age at menopause, y | 48.7 | 6.7 |
| Age at first child birth, y | 23.6 | 4.5 |
| Parity | 2.1 | 1.1 |
| HRT use | ||
| Never users | 653 (50.8%) | |
| Past users | 621 (48.3%) | |
| Current usersb | 11 (0.01%) | |