Vitamin D3 supplementation in obese, African-American, vitamin D deficient adolescents.

While no relationship between iPTH and 25OHD was found at baseline, longitudinal models that included all baseline and follow-up data found a near-significant negative relationship between iPTH and 25OHD (β-coefficient = −0.50; 95%CI: −1.0 to 0.01; p = 0.055).

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found that increased total, free, and bioavailable 25OHD were positively associated with increased arterial stiffness specifically in AA adolescent females, while in Whites, the reverse association between vitamin D measures and arterial stiffness existed but did not reach statistical significance [35] .

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