Table 2:
Characteristics of 742 participants in the prospective cohort Study of Environment, Lifestyle, and Fibroids (SELF) at baseline (2010–2012)
| Characteristic | Mean (SD) or N | % |
|---|---|---|
|
| ||
| Mean age in years (SD) | 28.6 (3.5) | - |
| Age, years | ||
| 23–25 | 179 | 24.1 |
| 26–28 | 182 | 24.5 |
| 29–31 | 198 | 26.7 |
| 32–35 | 183 | 24.7 |
| Mean BMI, kg/m2 (SD) | 33.7 (9.5) | - |
| BMI, kg/m2 | ||
| <25 | 139 | 18.7 |
| 25–29.9 | 157 | 21.2 |
| 30–34.9 | 147 | 19.8 |
| 35–39.9 | 124 | 16.7 |
| ≥40 | 175 | 23.6 |
| Education | ||
| ≤High school diploma/GED | 156 | 21.0 |
| Some college/Associate’s/Technical | 385 | 51.9 |
| ≥Bachelor’s degree | 201 | 27.1 |
| Annual household income, U.S. dollar | ||
| <20,000 | 340 | 45.8 |
| 20,000–50,000 | 280 | 37.7 |
| >50,000 | 122 | 16.4 |
| Urban residence in years | ||
| <5 | 70 | 9.4 |
| 5–9 | 40 | 5.4 |
| 10–19 | 155 | 20.9 |
| ≥20 | 477 | 64.3 |
| Cigarette smoking history | ||
| Never | 544 | 73.3 |
| Past | 59 | 8.0 |
| Current | 139 | 18.7 |
| Alcohol consumption, past yeara | ||
| None | 210 | 28.3 |
| Moderate | 383 | 51.6 |
| Heavy | 149 | 20.1 |
| Birth order | ||
| First | 308 | 41.5 |
| Second | 210 | 28.3 |
| Third or higher | 224 | 30.2 |
| Breastfed as an infant | ||
| Never breastfed | 521 | 70.2 |
| <3 months | 110 | 14.8 |
| ≥3 months | 111 | 15.0 |
| Parity | ||
| Nulliparous | 281 | 37.9 |
| 1 birth | 201 | 27.1 |
| 2 births | 127 | 17.1 |
| ≥3 births | 133 | 17.9 |
| Duration of lactation among parous women (n=461) | ||
| None | 159 | 34.5 |
| 1–3 months | 113 | 24.5 |
| 4–6 months | 70 | 15.2 |
| 7–12 months | 63 | 13.7 |
| >12 months | 56 | 12.2 |
| Mean dietary intake (SD) | ||
| Fish (grams/week) | 27.8 (32.6) | - |
| Meat (grams/week) | 53.5 (63.7) | - |
| Poultry (grams/week) (SD) | 35.6 (36.5) | - |
| Egg (grams/week) (SD) | 14.9 (14.4) | - |
| Dairy (servings/day) (SD) | 1.0 (0.8) | - |
| Vegetable (servings/day) (SD) | 3.0 (2.3) | - |
| Fruit (cups/day) (SD) | 1.4 (1.2) | - |
| Water intake (glasses of bottled or tap/day) | ||
| ≤2 | 215 | 29.0 |
| 3–4 | 298 | 40.2 |
| ≥5 | 229 | 30.9 |
| Occupation (≥1-month): | ||
| Farm | 4 | 0.5 |
| Lawn care | 13 | 1.8 |
| Pesticides | 5 | 0.7 |
| Participant’s mother: | ||
| Lived on a farm for ≥1-month during pregnancy | 4 | 0.5 |
| Worked on a farm for ≥1-month during pregnancy | 6 | 0.8 |
| Before the age of 18, lived on or visited a farm for ≥1-month | 29 | 3.9 |
| Used pesticides in past 24 hours | 11 | 1.5 |
| Used bug repellant in past 24 hours | 6 | 0.8 |
Abbreviations: BMI= Body mass index, GED= General education diploma, SD= standard deviation
a
Alcohol use in past year categories: none, “moderate”: 1–5 drinks/day, or ≥4 drinks once per month or less, or “heavy”: ≥6 drinks/day, or ≥4 drinks twice per month or more