Table 1 Characteristics of participants from the Uterine Fibroid Study included in the menstrual cycle characteristics analysis (N = 636), Washington D.C. (1996 – 1999)
N (%) | 25(OH)D mean (SD) | |
|---|---|---|
25(OH)D | ||
≤20 ng/mL | 484 (76) | -- |
>20 ng/mL | 152 (24) | -- |
Irregular cycles | ||
No | 588 (92) | 14.3 (8.3) |
Yes | 48 (8) | 10.4 (6.1) |
Short cycles (17 – 25 days) | ||
No | 453 (71) | 14.7 (8.4) |
Yes | 135 (29) | 13.1 (7.9) |
Long cycles (32 – 56 days) | ||
No | 566 (89) | 14.3 (8.3) |
Yes | 22 (11) | 16.3 (9.4) |
Age | ||
35 - 39 | 310 (49) | 14.4 (8.3) |
40 - 44 | 326 (51) | 13.7 (8.1) |
Race | ||
White | 216 (34) | 20.5 (8.1) |
African-American | 369 (58) | 10.1 (5.8) |
Other | 51 (8) | 15.3 (5.7) |
Education | ||
Lest than a college degree | 311 (49) | 11.0 (6.5) |
College graduate or more | 319 (50) | 17.0 (8.7) |
Missing | 6 (0.9) | |
Body mass index | ||
<25 kg/m2 | 258 (41) | 17.6 (9.0) |
25 - < 30 | 170 (27) | 13.7 (7.5) |
30 - <40 | 159 (25) | 10.2 (5.7) |
≥40 | 49 (8) | 9.0 (4.5) |
Smoker | ||
Non-smoker | 490 (77) | 14.8 (8.4) |
Current smoker | 146 (23) | 11.6 (7.1) |
Alcohol (drinks per week) | ||
0 | 120 (19) | 10.6 (6.1) |
>0 - 1 | 188 (30) | 13.3 (7.4) |
>1 – 7 | 211 (33) | 16.2 (8.5) |
>7 | 79 (12) | 15.3 (10.0) |
Missing | 40 (6) | |
Vigorous physical activity | ||
0 – 1.8 MET-hours/weeka | 203 (32) | 11.9 (7.2) |
>1.8 – 4.1 | 203 (32) | 14.2 (8.1) |
>4.1 – 6.5 | 108 (17) | 15.0 (8.5) |
>6.5 – 24.3 | 121 (19) | 16.6 (8.9) |
Missing | 1 (0.2) | |
Age at menarche | ||
<11 years | 51 (8) | 12.4 (7.1) |
11 - 14 | 506 (80) | 14.3 (8.2) |
>14 years | 77 (12) | 13.4 (8.9) |
Missing | 2 (0.3) |