Table 1 Baseline characteristics of New York city multiethnic breast cancer project (N = 114) by serum 25(OH)D levels above and below the median; 2007-2008
From: Mammographic density and serum 25-hydroxyvitamin D levels
Characteristic | Total (N = 114) | Serum 25(OH)D | P-valueb | |
|---|---|---|---|---|
≤ Mediana | > Mediana | |||
Mean age at interview, years (SD) | 50.0 (5.8) | 49.4 (5.9) | 50.7 (5.6) | 0.233 |
Race/ethnicity, N (%) | ||||
White | 28 (25) | 8 (14) | 20 (36) | 0.008 |
African American | 47 (41) | 32 (54) | 15 (27) | |
African Caribbean | 21 (18) | 9 (15) | 12 (22) | |
Hispanic/Other | 18 (16) | 10 (17) | 8 (15) | |
Menopausal status, N (%) | ||||
Pre/perimenopausal | 73 (64) | 41 (69) | 32 (58) | 0.209 |
Postmenopausal | 41 (36) | 18 (31) | 23 (42) | |
Highest level of education, N (%) | ||||
≤High school | 34 (30) | 22 (37) | 12 (22) | 0.045 |
Some college/associate degree | 35 (31) | 20 (34) | 15 (27) | |
≥College degree | 45 (39) | 17 (29) | 28 (51) | |
Mean body mass index, kg/m2 (SD) | 29.2 (6.3) | 30.3 (6.1) | 28.1 (6.3) | 0.055 |
First-degree family history of breast cancer, N (%) | ||||
Yes | 17 (15) | 10 (17) | 7 (13) | 0.554 |
No | 96 (85) | 49 (83) | 47 (87) | |
Mean age at menarche, years (SD) | 12.5 (1.8) | 12.3 (1.8) | 12.6 (1.8) | 0.366 |
Mean parity, N (SD) | 1.6 (1.4) | 1.5 (1.5) | 1.7 (1.3) | 0.534 |
Mean age at first live birth, years (SD) | 22.6 (6.8) | 21.7 (6.9) | 23.5 (6.7) | 0.248 |
Ever breast fed, N (%) | ||||
Yes | 46 (40) | 17 (29) | 29 (53) | 0.009 |
No | 68 (60) | 42 (71) | 26 (47) | |
Ever hormonal birth control use, N (%) | ||||
Yes | 78 (68) | 43 (73) | 35 (64) | 0.289 |
No | 36 (32) | 16 (27) | 20 (36) | |
Season of blood draw, N (%) | ||||
January-March | 62 (54) | 34 (58) | 28 (51) | 0.017 |
April-June | 29 (25) | 19 (32) | 10 (18) | |
July-September | 19 (17) | 6 (10) | 13 (24) | |
October-December | 4 (4) | 0 (0) | 4 (7) | |
Mean percent density, % (SD) | 12.9 (11.4) | 13 (11.1) | 12.7 (11.8) | 0.875 |
Mean dense area, cm2 (SD) | 17.4 (14.7) | 19.7 (16.1) | 14.9 (12.8) | 0.086 |
Mean non-dense area, cm2 (SD) | 148 (82.3) | 158 (78.2) | 137 (85.9) | 0.185 |