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. 2016 Sep 23;8(10):592. doi: 10.3390/nu8100592

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Prevalence of serum 25(OH)D concentration categories according to season, occupation, and sex subgroups (red: <10 ng/mL, orange: 10 to 20 ng/mL, gold: 20 to 30 ng/mL, green: >30 ng/mL).

Prevalence of serum 25(OH)D concentration categories according to season, occupation, and sex subgroups (red: <10 ng/mL, orange: 10 to 20 ng/mL, gold: 20 to 30 ng/mL, green: >30 ng/mL).