Table 1.
Age-standardized baseline characteristics according to history of reproductive surgery among participants aged 40–69 years in the Black Women's Health Study
| Characteristic | No hysterectomy | Hysterectomy alone | With bilateral oophorectomy |
|---|---|---|---|
| N (%) | 35,382 (79.5) | 4,576 (10.3) | 4,556 (10.2) |
| Age, y (mean ± SD) | 43.5 ± 5.7 | 47.5 ± 7.3 | 50.3 ± 7.9 |
| Age at surgery, y (mean ± SD) | NA | 37.8 ± 5.1 | 39.5 ± 6.8 |
| Region (%) | |||
| Northeast | 27.9 | 16.6 | 17.1 |
| South | 30.7 | 37.9 | 39.9 |
| Midwest | 22.7 | 26.5 | 25.8 |
| West | 18.7 | 19.0 | 17.2 |
| Education ≥16 y (%) | 50.8 | 40.9 | 37.3 |
| Parity ≥3 births (%) | 24.4 | 25.9 | 23.1 |
| Oral contraceptive use ≥5 y (%) | 36.3 | 31.3 | 28.5 |
| Menopausal hormone use ≥2 y (%) | 3.3 | 10.5 | 51.7 |
| Body mass index ≥30 kg/m2 (%) | 29.2 | 33.7 | 39.2 |
| Vigorous activity ≥5 h/wk (%) | 9.8 | 9.4 | 8.2 |
| Current smoker (%) | 16.5 | 17.4 | 22.0 |
| Alcohol intake ≥7 drinks/wk (%) | 5.7 | 5.9 | 5.4 |
| Family history of breast cancer (%) | 9.8 | 10.4 | 10.9 |