Logistic regression resulted in a model of vitamin A deficiency dependent on RBP, transthyretin and C-reactive protein and a linear predictor of (−15.277 × [RBPμmol/L] - 7.013 × [Transthyretinμmol/L] + 0.367 × [C-reactive proteinmg/L] + 24.714). This evidence concerns the gene TTR and vitamin A deficiency.