Table 1.
Baseline characteristics of women in the Nurses’ Health Study II in 1989 by laparoscopically-confirmed endometriosis
| Baseline characteristics | Laparoscopically-Confirmed Endometriosis | |
|---|---|---|
| Yes (n=4,244) | No (n=91,554) | |
| Age (years)*, mean(SD) | 35.8(4.1) | 34.5(4.6) |
| White race, % | 94 | 93 |
| BMI† at age 18 (kg/m2) | 20.7(3.0) | 21.1(3.2) |
| BMI at baseline (kg/m2) | 23.3(4.2) | 23.7(4.6) |
| Age at menarche | ||
| - ≤ 11 years old, % | 27 | 24 |
| - 12–13 years old, % | 57 | 58 |
| - ≥ 14 years old, % | 16 | 18 |
| Parity | ||
| - Nulliparous, % | 42 | 30 |
| - 1 pregnancy >6 months, % | 24 | 19 |
| - 2 pregnancies >6 months, % | 26 | 33 |
| - 3+ pregnancies >6 months, % | 10 | 18 |
| Oral contraceptive use, ever % | 89 | 83 |
| Cigarette smoking history, never, % | 66 | 66 |
| Alcohol intake (grams), mean(SD) | 3.0(6.0) | 3.2(6.1) |
| Alternate health eating index 2010‡, mean(SD) | 1.9(1.4) | 2.0(1.4) |
| Physical activity, (METS/week)§, mean(SD) | 24.9(35.5) | 25.2(37.0) |
| Multivitamin use, % | 48 | 44 |
| Family history of hypertension, % | 52 | 51 |
| Health care usage, % | 98 | 95 |
| Menopausal status, premenopausal, % | 88 | 99 |
| Postmenopausal hormone use, % | 30 | 9 |
| Hysterectomy, % | 18 | 4 |
| Oophorectomy | ||
| - Unilateral, % | 3 | 1 |
| - Bilateral, % | 11 | 1 |
| Analgesic use (>=2 day/week)‖, % | 49 | 39 |
| Systolic blood pressure | ||
| - < 115 mmHg, % | 65 | 65 |
| - 115–125 mmHg, % | 27 | 26 |
| - 125–135 mmHg, % | 7 | 7 |
| - ≥135 mmHg, % | 2 | 2 |
| Diastolic blood pressure | ||
| - < 90 mmHg, % | 99 | 99 |
| - ≥90 mmHg, % | 1 | 1 |
| Serum cholesterol level | ||
| - <240 mg/dl, % | 99 | 99 |
| - ≥240 mg/dl, % | 1 | 1 |
Values are means (SD) or percentages and are standardized to the age distribution of the study population.
Values of categorical variables may not sum to 100% due to rounding.
*
Value is not age adjusted
†
BMI=body mass index
‡
AHEI-201028 is a score that measures adherence to a diet pattern based on foods and nutrients most predictive of disease risk in the literature
§
METS=metabolic equivalents from recreational and leisure-time activities
‖
Analgesic included acetaminophen, aspirin, ibuprofen, indometacin, naproxen, nabumetone, ketoprofen, celecoxib, rofecoxib and valdecoxib.