Table 1.
Baseline characteristics of women, Women’s Health Initiative Observational Study.
| (N=72,982) | ||
|---|---|---|
| N | Mean (SD) or % | |
| Mean age screening, y | 72982 | 63.2 (7.3) |
|
| ||
| Race/ethnicity | ||
| White | 62462 | 85.6 |
| Black | 5030 | 6.9 |
| Hispanic | 2251 | 3.1 |
| Native American | 256 | 0.4 |
| Asian/Pacific Islander | 2093 | 2.9 |
| Unknown | 890 | 1.2 |
|
| ||
| Education | ||
| 0–8 years | 816 | 1.1 |
| Some high school | 2097 | 2.9 |
| High school diploma/GED | 11146 | 15.4 |
| School after high school | 26019 | 35.9 |
| College degree or higher | 32367 | 44.7 |
|
| ||
| Family income | ||
| < $10,000 | 2430 | 3.6 |
| $10,000–$19,999 | 7031 | 10.3 |
| $20,000–$34,999 | 15391 | 22.6 |
| $35,000–$49,999 | 13921 | 20.5 |
| $50,000–$74,999 | 14344 | 21.1 |
| $75,000 + | 14908 | 21.9 |
|
| ||
| Smoking status | ||
| Never | 37117 | 50.9 |
| Past | 31421 | 43.1 |
| Current | 4444 | 6.1 |
|
| ||
| Body-mass index, kg/m2 | 72207 | 27.1 (5.8) |
|
| ||
| Systolic BP, mm Hg | 72982 | 126.2 (17.8) |
|
| ||
| Diastolic BP, mm Hg | 72946 | 74.7 (9.2) |
|
| ||
| History of diabetes requiring medications | 3444 | 4.7 |
|
| ||
| History of high cholesterol requiring medications | 9623 | 13.2 |
|
| ||
| On antihypertensive medications | 17609 | 24.1 |
|
| ||
| Age at menarche, y | ||
| ≤11 | 16216 | 22.2 |
| 12 | 19160 | 26.3 |
| 13 | 21369 | 29.3 |
| ≥14 | 16237 | 22.2 |
|
| ||
| Number of pregnancies | ||
| None | 8273 | 11.3 |
| 1 | 4899 | 6.7 |
| 2–4 | 43539 | 59.7 |
| 5+ | 16271 | 22.3 |
|
| ||
| Number of live births± | ||
| None | 10555 | 14.5 |
| 1 | 6216 | 8.5 |
| 2–4 | 47608 | 65.2 |
| 5+ | 8603 | 11.8 |
|
| ||
| Age at first birth± | ||
| No term pregnancy | 10462 | 14.3 |
| <20 | 8780 | 12.0 |
| 20–24 | 29803 | 40.8 |
| 25–29 | 17834 | 24.4 |
| 30–34 | 4638 | 6.4 |
| 35–39 | 1242 | 1.7 |
| 40–44 | 211 | 0.3 |
| 45+ | 12 | <0.1 |
|
| ||
| Number of still births± | ||
| None | 70218 | 96.2 |
| 1 | 2375 | 3.3 |
| 2–4 | 365 | 0.5 |
| 5+ | 24 | <0.1 |
|
| ||
| Number of miscarriages± | ||
| None | 51279 | 70.3 |
| 1 | 14536 | 19.9 |
| 2–4 | 6691 | 9.2 |
| 5+ | 476 | 0.7 |
|
| ||
| Number of tubal pregnancies± | ||
| None | 71407 | 97.8 |
| 1 | 1444 | 2.0 |
| 2–4 | 123 | 0.2 |
| 5+ | 8 | <0.1 |
|
| ||
| Irregular periods | ||
| Yes | 5672 | 7.8 |
| No | 60169 | 82.4 |
| Sometimes regular, sometimes irregular | 7141 | 9.8 |
|
| ||
| Tried becoming pregnant for more than 1 year | 12346 | 16.9 |
|
| ||
| Saw doctor because you didn’t conceive | 9823 | 67.1 |
|
| ||
| Reason found for non-pregnancy | 5729 | 62.8 |
|
| ||
| Reason–hormones or ovulation | 977 | 1.4 |
|
| ||
| Reason–tubes or uterus | 1818 | 2.6 |
|
| ||
| Reason—endometriosis | 1007 | 1.4 |
|
| ||
| Reason–other problem with you | 1006 | 1.4 |
|
| ||
| Reason–problem with partner | 1907 | 2.7 |
|
| ||
| Reason–don’t know reason | 4264 | 6.1 |
|
| ||
| Breastfed for at least one month | 36884 | 50.5 |
|
| ||
| Hysterectomy at randomization | 30011 | 41.1 |
|
| ||
| Estrogen + progesterone use | ||
| Never | 51160 | 70.1 |
| Past | 6536 | 9.0 |
| Current | 15257 | 20.9 |
|
| ||
| Unopposed estrogen use | ||
| Never | 45712 | 62.7 |
| Past | 8683 | 11.9 |
| Current | 18542 | 25.4 |