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. 2016 Sep 2;3(1):22. doi: 10.1186/s40662-016-0053-7

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Correlative evaluation of total 25-hydroxyvitamin D levels in serum and tear fluid. a Box and whiskers plot indicating the median levels of total 25-hydroxyvitamin D measured in the serum and tear fluid. b Correlation between serum and tear total 25-hydroxyvitamin D [25(OH) Vit D] levels (n = 48), r - Spearman correlation. c Bland-Altman plot showing the agreement between tear and serum 25-hydroxyvitamin D levels. The average total 25-hydroxyvitamin D in the x-axis indicates the mean of tear and serum 25-hydroxyvitamin D levels. n = 48; ****p < 0.0001, Wilcoxon matched-pairs signed rank test