Figure 2.

Concentration of plasma 25-(OH)D after intervention with either tricalcium phosphate, vitamin D3 or both. n =55; CaP: tricalcium phosphate; 25-(OH)D: 25-hydroxyvitamin D; broken line: recommended 25-(OH)D concentration; dotted line: optimal 25-(OH)D concentration; a b data are expressed as mean and standard deviation; mean values within a row with dissimilar superscript letters are significantly different (p ≤ 0.05); * significant difference between groups; effect of time was tested using general linear model with repeated measurements (with pairwise comparisons based on Fishers-LSD test); effect of supplementation was tested using univariate analysis of variance followed by Student-Newman-Keuls post hoc test.

Trautvetter et al. Nutrition Journal 2014 13:6   doi:10.1186/1475-2891-13-6
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