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SARS-CoV-2 positivity rates associated with circulating 25-hydroxyvitamin D levels

Fig 2

SARS-CoV-2 NAAT Positivity Rates and Circulating 25(OH)D Levels, (A) by Latitude Region and (B) Predominately Black non-Hispanic, Hispanic, and White non-Hispanic Zip Codes. Smooth lines represent 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: Northern: y = 0.2544–0.0055*x + 5.2e-05*x2; R2 = 0.94. Central: y = 0.1745–0.0049*x + 4.7e-05*x2; R2 = 0.94. Southern: y = 0.1693–0.0052*x + 5.2e-05*x2; R2 = 0.90. Black non-Hispanic: y = 0.2948–0.0067*x + 5.8e-05*x2; R2 = 0.87. Hispanic: y = 0.2873–0.0083*x + 8.5e-05*x2; R2 = 0.95. White non-Hispanic: y = 0.1219–0.0021*x + 1.5e-05*x2; R2 = 0.92. SI conversion factor: 1 ng/mL = 0.400641 nmol/L.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0239252.g002