Multivariate Cox regression analysis for vitamin D and other selected possible predictors of mortality in patients with AKI.

Note: The multivariate analysis sequentially adjusted the models for covariates as follows: Model 1, unadjusted; Model 2, adjusted for VDR polymorphisms; Model 3, adjusted for age, gender, and VDR polymorphisms; Model 4, adjusted for age, gender, SOFA score, and VDR polymorphisms.Abbreviations: 25(OH)D, 25-hydroxyvitamin D; 1,25(OH)2D, 1,25-dihydroxyvitamin D; SOFA, Sequential Organ Failure Assessment.