Association between serum 25(OH)D, DBP, and the 25(OH)D:DBP molar ratio, and the risk of colorectal cancer, ATBC Study.

Conditional logistic regression was used for all models. OR  =  odds ratio; CI  =  confidence interval.
1Cut-points for season specific quartiles (nmol/L): winter  = Q1: ≤18.3, Q2: >18.3–≤26.9, Q3: >26.9–≤42.0, Q4: >42.0; summer  = Q1: ≤27.0, Q2: >27.0 and ≤38.7, Q3: >38.7–≤53.4, Q4: >53.4.
2Conditioned on the matching factors age at randomization and date of blood collection.
3Conditioned on the matching factors age at randomization and date of blood collection and adjusted for years of smoking, serum α-tocopherol, serum β-carotene, serum retinol, BMI, height, and physical activity.
4Adjusted for factors in model 2 with additional adjustment for quartiles of 25(OH)D or DBP.