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. 2020 Sep 17;15(9):e0239252. doi: 10.1371/journal.pone.0239252

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© 2020 Kaufman et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 1 — Smooth line represents the weighted second order polynomial regression fit to the data associating circulating 25(OH)D levels (x) and SARS-CoV-2 positivity rates (y) where: y = 0.2029–0.0052*x + 4.8e-05*x²; R² = 0.96. SI conversion factor: 1 ng/mL = 0.400641 nmol/L.