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(a) Plasma transthyretin (TTR) concentrations are not associated with stage of chronic kidney disease (CKD) and (b) the retinol binding protein 4 (RBP4)/TTR ratio is higher in subjects with CKD than in healthy subjects and highest among patients on dialysis. (c) RBP4 and (d) retinol are not associated with intake of vitamin A activity units in patients with CKD (p > 0.3). (e) Body mass index (BMI) is also not associated with plasma RPB4 concentration. ***p ≤ 0.001.
