Heritability estimates (h2) for breast density measures (n = 1,140) and serum sex-hormone levels (n = 810)
| Trait | Age and menopausal status adjusted | Multivariate adjusted |
|---|---|---|
| h2 ± SE | h2 ± SE | |
| Density measures | ||
| Percentage density | 0.70 ± 0.08 | 0.63 ± 0.08 |
| Absolute dense area | 0.68 ± 0.08 | 0.66 ± 0.08 |
| Nondense area | 0.77 ± 0.06 | 0.65 ± 0.07 |
| Hormone levels | ||
| Estradiol | 0.52 ± 0.10 | 0.40 ± 0.10 |
| Testosterone | 0.27 ± 0.10 | 0.25 ± 0.10 |
| SHBG | 0.59 ± 0.09 | 0.58 ± 0.10 |