TABLE 1.
Characteristics of Premenopausal Participants in the NIEHS Uterine Fibroid Study with Blood Specimens and Fibroid Data.
| Characteristic | Blacks n = 585 No. (%) |
Whites n = 403 No. (%) |
|---|---|---|
| Fibroid statusa | ||
| None | 158 (27) | 200 (50) |
| Small | 95 (16) | 70 (17) |
| Medium | 191 (33) | 89 (22) |
| Large | 141 (24) | 44 (11) |
| Source of fibroid status data | ||
| Ultrasound | 564 (96) | 396 (98) |
| Surgical report | 11 (2) | 2 (1) |
| Self-report | 10 (2) | 5 (1) |
| Age (y) | ||
| 35–39 | 216 (37) | 136 (34) |
| 40–44 | 209 (36) | 136 (34) |
| 45–49 | 160 (27) | 131 (33) |
| Education | ||
| High school or less | 124 (21) | 12 (3) |
| Some beyond high school | 269 (46) | 33 (8) |
| College degree | 71 (12) | 67 (17) |
| Postbaccalaureate | 116 (20) | 281 (72) |
| Missing | 5 | 10 |
| BMI at enrollment | ||
| <25 | 149 (25) | 234 (58) |
| 25–29.99 | 180 (31) | 96 (24) |
| 30–34.99 | 115 (20) | 37 (9) |
| 35+ | 141 (24) | 36 (9) |
| Age of menarche (y) | ||
| <11 | 63 (11) | 17 (4) |
| 11 | 92 (16) | 61 (15) |
| 12 | 160 (27) | 111 (28) |
| 13 | 140 (24) | 135 (34) |
| 14 | 57 (10) | 43 (11) |
| >14 | 70 (12) | 34 (8) |
| Missing | 3 | 2 |
| Parous | ||
| No | 121 (21) | 236 (59) |
| Yes | 464 (79) | 167 (41) |
| No. of full-term pregnancies delivered after age 24 | ||
| 0 | 294 (50) | 255 (63) |
| 1 | 181 (31) | 56 (14) |
| 2 | 87 (15) | 81 (20) |
| 3+ | 22 (4) | 11 (3) |
| Smoking status | ||
| Never | 279 (48) | 234 (58) |
| Past | 136 (23) | 137 (34) |
| Current, < 10/d | 102 (18) | 14 (3) |
| Current, 10-19/d | 55 (9) | 12 (3) |
| Current, 20+/d | 9 (2) | 6 (1) |
| Alcohol (drinks/wk) | ||
| <0.5 | 301 (55) | 60 (16) |
| 0.5–2 | 122 (22) | 113 (30) |
| >2–<7 | 65 (12) | 102 (27) |
| 7+ | 60 (11) | 96 (26) |
| Missing | 37 | 32 |
a
Fibroid status was categorized based on the diameter of largest fibroid (<2 cm, small; >2->4 cm, medium; ≥4 cm, large).