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 |
---|---|---|---|---|---|---|
 | Cut points (ng/mL)§ | < 18.4 | 18.4 to < 24.6 | 24.6 to < 30.6 | ≥ 30.6 |  |
 | Cases/controls | 141/300 | 151/305 | 145/307 | 176/306 |  |
 | Simple | 1.00 (ref) | 1.06 (0.80 to 1.40) | 1.02 (0.77 to 1.36) | 1.26 (0.94 to 1.69) | 0.14 |
 | Multivariate* | 1.00 (ref) | 1.05 (0.79 to 1.39) | 0.95 (0.71 to 1.29) | 1.20 (0.88 to 1.63) | 0.32 |
Invasive | Cases/controls | 95/300 | 98/305 | 97/307 | 125/306 | Â |
 | Multivariate* | 1.00 (ref) | 1.03 (0.74 to 1.44) | 1.01 (0.72 to 1.42) | 1.29 (0.92 to 1.81) | 0.14 |
ER+†| Cases/controls | 79/300 | 72/305 | 70/307 | 100/306 |  |
 | Multivariate* | 1.00 (ref) | 0.89 (0.62 to 1.29) | 0.84 (0.57 to 1.23) | 1.21 (0.84 to 1.75) | 0.29 |
ER-†| Cases/controls | 16/300 | 20/305 | 21/307 | 20/306 |  |
 | Multivariate* | 1.00 (ref) | 1.26 (0.63 to 2.54) | 1.37 (0.67 to 2.79) | 1.31 (0.63 to 2.74) | 0.47 |
ER+/PR+†| Cases/controls | 71/300 | 60/305 | 58/307 | 86/306 |  |
 | Multivariate* | 1.00 (ref) | 0.82 (0.56 to 1.22) | 0.76 (0.51 to 1.15) | 1.16 (0.79 to 1.71) | 0.43 |
ER-/PR-†| Cases/controls | 14/300 | 18/305 | 21/307 | 17/306 |  |
 | Multivariate* | 1.00 (ref) | 1.27 (0.61 to 2.65) | 1.52 (0.73 to 3.19) | 1.18 (0.54 to 2.60) | 0.64 |