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Dose–response relationships between vitamin B6 status, measured as PLP, and quality of life outcomes. Deficient, suboptimal, and adequate vitamin B6 levels were defined as serum/plasma PLP < 20 nmol/L (n = 92), 20–30 nmol/L (n = 204), and > 30 nmol/L (n = 791), respectively. Abbreviations: PLP, pyridoxal 5′-phosphate; QoL, quality of life.
