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. 2021 Jun 14;21:566. doi: 10.1186/s12879-021-06281-7

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — Prevalence rates of vitamin D insufficiency or deficiency and of severe hypovitaminosis D in mildly-symptomatic SARS-CoV-2 infected subjects (mildly-symptomatic COVID-19), in COVID-19 patients admitted to hospital ward (COVID-19 non-ICU), in COVID-9 patients admitted to intensive care unit (COVID-19 ICU), in COVID-19 patients who died COVID-19 deceased) and in control subjects (matched controls). Legend: Data are shown as prevalence rates of vitamin D insufficiency (25OHD < 30 ng/mL), deficiency (25OHD < 20 ng/mL), or severe hypovitaminosis D (25OHD < 10 ng/mL) (B). ICU: intensive care Unit. Reference population: 3174 consecutive subjects, who underwent 25OHD measurement in Siena (Italy) between January 01 and March 31, 2020 in the frame of a routine health check with no epidemiological and clinical evidence of SARS-CoV-2 infection