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
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

aMedian 25(OH)D of 22 ng/ml.

bP-value based upon 2-sample t-tests for continuous variables and chi-square tests for categorical variables.

Crew et al.

Crew et al. Nutrition & Metabolism 2014 11:18   doi:10.1186/1743-7075-11-18

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