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Restricted Cubic Spline of the Association of Serum 25(OH)D With Risk of Incident Heart Failure: The ARIC Study 1990–2010*
(A) Whites; (B) blacks. *Knots at the 5th, 27.5th, 50th, 72.5th, and 95th percentiles, and adjusted for age and sex. 95% confidence intervals are in gray. 25(OH)D = 25-hydroxyvitamin D.