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Plasma vitamin C relative to renal function and hypertension: (A) patients with macroalbuminuria (ACR > 30) had significantly lower plasma vitamin C concentrations than those with normal renal function (ACR < 3; * p = 0.03). (B) Patients with eGFR <60 had comparable plasma vitamin C concentrations to those with eGFR ≥ 60 (p = 0.08). (C) Patients with treated hypertension (+) had lower vitamin C status than those without (−) (* p = 0.01).
