From: Plasma 25-hydroxyvitamin D and risk of breast cancer in the Nurses' Health Study II
 |  | Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 | P-value, test for trend |
---|---|---|---|---|---|---|
Age at blood ≤45 | Cases/controls | 63/139 | 66/136 | 70/163 | 91/169 |  |
 | Multivariate* | 1.00 (ref) | 1.07 (0.69 to 1.67) | 0.91 (0.58 to 1.41) | 1.19 (0.77 to 1.84) | 0.51 |
Age at blood > 45 | Cases/controls | 78/161 | 85/169 | 75/144 | 85/137 | Â |
 | Multivariate* | 1.00 (ref) | 1.05 (0.71 to 1.55) | 1.06 (0.70 to 1.61) | 1.22 (0.80 to 1.85) | 0.35 |
BMI < 25 | Cases/controls | 77/121 | 88/149 | 84/192 | 109/216 | Â |
 | Multivariate* | 1.00 (ref) | 0.99 (0.66 to 1.48) | 0.75 (0.50 to 1.13) | 0.90 (0.60 to 1.33) | 0.45 |
BMI ≥ 25 | Cases/controls | 64/179 | 63/156 | 61/115 | 67/90 |  |
 | Multivariate* | 1.00 (ref) | 1.09 (0.71 to 1.67) | 1.45 (0.92 to 2.28) | 1.90 (1.19 to 3.03) | 0.005 |
Summer | Cut points | < 21.2 | 21.2 to < 27.1 | 27.1 to < 32.7 | ≥ 32.7 |  |
 | Cases/controls | 73/142 | 70/142 | 73/143 | 71/144 |  |
 | Multivariate* | 1.00 (ref) | 0.95 (0.62 to 1.45) | 0.99 (0.65 to 1.53) | 0.97 (0.63 to 1.52) | 0.95 |
Winter | Cut points | < 16.5 | 16.5 to < 22.7 | 22.7 to < 28.4 | ≥ 28.4 |  |
 | Cases/controls | 71/161 | 83/159 | 78/165 | 94/162 |  |
 | Multivariate* | 1.00 (ref) | 1.22 (0.82 to 1.83) | 0.98 (0.65 to 1.47) | 1.22 (0.81 to 1.82) | 0.52 |