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. 2020 Nov 19;8:583206. doi: 10.3389/fped.2020.583206

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Copyright © 2020 Kondratyeva, Zakharova, Ilenkova, Klimov, Petrova, Zodbinova, Zhekaite, Chikunov, Dolbnya, Voronkova, Sherman, Loshkova, Melyanovskaya, Budzinskiy, Kuryaninova and Kutsev.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Subjects' blood 25(OH)D (ng/ml) concentrations in various age groups and different seasons. p is the level of significance of differences: p1–3 (1) < 0.05 is the significance between the level of 25(OH)D in winter and summer in children aged 0–3 years; p2–3 (2) < 0.05 is the significance between the levels of 25(OH)D in spring and in summer in children aged 4–10 years; p2–3 (3) < 0.05 is the significance between the levels of 25(OH)D in spring and in summer in children aged 11–18 years.