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Serum concentrations of vitamin D and parathyroid hormone and prevalent metabolic syndrome among adults in the United States

Background:  Some reports suggest that concentrations of vitamin D are inversely, whereas concentrations of parathyroid hormone (PTH) are directly, associated with prevalent metabolic syndrome. Because of lingering uncertainty about these associations, we examined the cross‐sectional associations between serum concentrations of 25‐hydroxyvitamin D3 and PTH with metabolic syndrome in a representative sample of adults in the US.