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. 2013 Oct 3;98(12):4816–4825. doi: 10.1210/jc.2013-2728

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Copyright © 2013 by The Endocrine Society

This article has been published under the terms of the Creative Commons Attribution License (CC-BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Copyright for this article is retained by the author(s). Author(s) grant(s) the Endocrine Society the exclusive right to publish the article and identify itself as the original publisher.

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Figure 4. — A–C, Relationship between serum 25(OH)D and fractional calcium absorption at baseline (A) (serum 25(OH)D, P = .001; race [white vs black], P < .0001; slope = −0.002, R² = 0.073, n = 297); 12 weeks (B) (25(OH)D, P = .13; race (white vs black), P < .0001; R² = 0.071, n = 297) and (C) as change from baseline to 12 weeks (C) (25(OH)D, P = .66; race, P = .12; R² = 0.013, n = 297). D, Relationship between vitamin D dose and change in fractional calcium absorption after 12 weeks of supplementation (vitamin D dose, P = .54; race, P = .12). Filled circles and solid lines indicate blacks, and open circles and dotted lines indicate whites.