Table 1.
Baseline characteristics according to ever diagnosis and early diagnosis of uterine leiomyomata in the Black Women’s Health Studya
| Uterine leiomyomata
|
|||
|---|---|---|---|
| No (n=36,135) | Yes (n=11,132) | Age at diagnosis <30 (n=3,856) | |
| Age, mean years (SD) | 36.4 (9.8) | 37.2 (9.3) | 36.7 (9.3) |
| Body Mass Index, mean kg/m2 (SD) | 27.7 (6.8) | 28.0 (6.5) | 27.9 (6.5) |
| >12 years of education, % | 83.3 | 87.1 | 58.4 |
| Single, % | 39.4 | 35.4 | 35.2 |
| Age at menarche, mean years (SD) | 12.4 (1.6) | 12.1 (1.6) | 12.1 (1.6) |
| Nulliparous, % | 38.8 | 39.3 | 38.1 |
| Ever smoker, % | 32.5 | 32.4 | 33.3 |
| Vigorous physical activity, ≥5 hours/week, % | 13.8 | 13.5 | 13.7 |
| Ever use of oral contraceptives, % | 84.8 | 88.7 | 89.0 |
| Natural menopause, % | 9.4 | 8.8 | 9.2 |
| Ever use of estrogen-only menopausal female hormones, % | 1.3 | 1.8 | 2.0 |
| Ever use of estrogen and progesterone menopausal female hormones, % | 3.3 | 3.7 | 3.9 |
SD=standard deviation
a
All characteristics (with the exception of age and proportion of women having experienced natural menopause) are standardized to the age distribution of the cohort in 1995.