Predictors | Beta-coefficient for difference in 25(OH)D (ng/mL) | P | Squared semi-partial correlation coefficient (%)a |
---|---|---|---|
Intercept | 11.94 | ||
Supplementary vitamin D | 9.66 | <0.0001 | 10.41 |
Multivitamin use | 4.60 | <0.0001 | 2.75 |
Dietary vitamin D (kcal-mcg/day) | 0.33 | 0.01 | 0.23 |
Body mass index | |||
25.0–29.9 | -2.21 | 0.001 | 0.22 |
30.0–34.9 | -2.96 | <0.0001 | 0.36 |
≥ 35.0 | -4.71 | <0.0001 | 0.84 |
Postmenopausal hormone use | |||
Past use ≥5 years | 2.70 | 0.001 | 0.30 |
Current use <5 years | 2.39 | 0.02 | 0.18 |
Current use ≥5 years | 2.31 | 0.03 | 0.16 |
Vigorous physical activity, ≥1 hour/week | 1.59 | 0.001 | 0.34 |
Alcohol consumption | |||
1–6 drinks per week | -2.28 | 0.02 | 0.20 |
≥7 drinks per week | -2.97 | 0.006 | 0.26 |
Cigarette smoking | -1.58 | 0.13 | 0.08 |
Recent use of oral contraceptives | 2.58 | 0.003 | 0.28 |
Use of oral contraceptives ≥10 years | 1.60 | 0.02 | 0.19 |
Variables controlled in the regression models | |||
Season of blood draw | |||
Summer | 1.66 | 0.01 | 0.14 |
Winter | -1.88 | 0.003 | 0.28 |
UVB flux 160+ | -1.93 | 0.01 | 0.09 |
Age (years) | 0.24 | <0.0001 | 1.40 |