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(a) 25-hydroxyvitamin D: ANOVA, p = 0.083. (b) 1,25-dihydroxyvitamin D: ANOVA, p = 0.042. *p≤0.05, patients in Risk stage compared with patients in Failure stage. AKI, acute kidney injury; RIFLE, Risk, Injury, Failure, Loss, and End-stage kidney disease; ANOVA, analysis of variance.
