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. 2016 Feb 15;5:e10. doi: 10.1017/jns.2015.38

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© The Author(s) 2016

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited

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Fig. 2. — Incidence of postoperative atrial fibrillation (POAF) according to quartiles of the preoperative plasma levels (nmol/l) of 25-hydroxyvitamin D₂ (25(OH)D₂; --Δ--), 25(OH)D₃ (–■–) and total 25(OH)D (--○--) in patients undergoing open heart surgery. Data were analysed by Pearson's χ² and Somers’ d statistics for trend in association between ordinal variables.