Table I.
Descriptive characteristics at enrollment, sample from National Institute of Environmental Health Sciences Uterine Fibroid Study.
| Whites 380 |
African-Americans 515 |
|||
|---|---|---|---|---|
| N | (%) | N | (%) | |
| Year of enrollment | ||||
| 1996 | 72 | (19) | 96 | (19) |
| 1997 | 160 | (42) | 224 | (44) |
| 1998 | 148 | (39) | 193 | (37) |
| 1999 | 0 | (0) | 2 | (<1) |
| Age at baseline (years) | ||||
| 35–37 | 77 | (20) | 109 | (21) |
| 38–40 | 76 | (20) | 116 | (23) |
| 41–43 | 78 | (21) | 113 | (22) |
| 44–46 | 82 | (21) | 109 | (21) |
| 47–50 | 67 | (18) | 68 | (13) |
| Education | ||||
| <High school | 0 | (0) | 9 | (2) |
| High school | 11 | (3) | 91 | (18) |
| Some college/no degree | 30 | (8) | 240 | (46) |
| College degree | 64 | (17) | 68 | (13) |
| College plus additional training | 62 | (16) | 45 | (9) |
| Post graduate degree | 212 | (56) | 60 | (12) |
| Missing | 1 | – | 2 | – |
| BMI (kg/m2) | ||||
| <25 | 222 | (58) | 133 | (26) |
| 25–29 | 91 | (24) | 154 | (30) |
| 30<35 | 33 | (9) | 104 | (20) |
| ≥35 | 34 | (9) | 124 | (24) |
| Smoking | ||||
| Never | 223 | (59) | 250 | (49) |
| Past | 131 | (34) | 115 | (22) |
| Current | ||||
| <10 cigarettes per day | 9 | (2) | 73 | (14) |
| 10–20 cigarettes per day | 10 | (3) | 37 | (7) |
| ≥20 cigarettes per day | 7 | (2) | 40 | (8) |
| Gravidity | ||||
| 0 | 152 | (40) | 46 | (9) |
| ≥1 | 228 | (60) | 469 | (91) |
| Parity | ||||
| 0 | 223 | (59) | 110 | (21) |
| 1 | 50 | (13) | 117 | (23) |
| ≥2 | 107 | (28) | 288 | (56) |
| Fibroids diagnosed prior to enrollment | ||||
| Yes | 61 | (16) | 234 | (45) |
| No | 319 | (84) | 281 | (55) |
| Fibroids at baselinea | ||||
| Yes | 189 | (50) | 383 | (74) |
| No | 191 | (50) | 132 | (26) |
| Fibroid size (diameter of largest fibroid) | ||||
| No fibroids | 191 | (50) | 132 | (26) |
| <2 cm | 66 | (17) | 89 | (17) |
| 2–3.99 cm | 80 | (21) | 184 | (36) |
| ≥4 cm | 43 | (11) | 110 | (21) |
| Fibroid type | ||||
| No fibroids | 191 | (51) | 132 | (27) |
| Submucosal | 37 | (10) | 81 | (17) |
| No submucosal | 144 | (39) | 274 | (56) |
| Missing fibroid type | 8 | – | 28 | – |
aIncludes newly detected and previously diagnosed.