Objective. To determine the vitamin D supply of children in different age groups to identify risk groups based on its low status. Patients and methods. Study design: observational, analytical, cross-sectional. By using a random sampling method, the study included relatively healthy children aged 0 to 18 years (n = 226), undergoing examination in medical organizations of the Ministry of Health of the Khabarovsk Territory in the autumn-winter period. Children were divided into groups, according to the age range: newborns (n = 67), early years (1–3 years, n = 58), preschool age (4–6 years, n = 37), primary school age (7–9 years, n = 34) and teenagers (10–18 years, n = 30). Quantitative determination of the level 25-hydroxyvitamin D (25(OH)D) in blood serum was performed by enzyme-linked immunosorbent analysis. Results. The low vitamin D level was detected is one in every two children in the population in Khabarovsk (47.8%). An increase in the prevalence of vitamin D deficiency was found as children grew older (p < 0.001) and, accordingly, a decrease in its adequate supply (p < 0.001). The highest prevalence of low vitamin D status was determined in children aged 10–18 years (80.0%), slightly less in primary schoolchildren (67.6%), vitamin D deficiency and insufficiency occurred in preschool and early age children in 64 .9 and 46.6% of cases, respectively, and significantly less often in newborns – 14.9% (p < 0.001). The prevalence of vitamin D deficiency in school-age children was 2 times (OR = 1.939; 95% CI 1.011–3.720) higher compared to children aged 1 to 6 years. Conclusion. The study demonstrates the high prevalence rate of children with low vitamin D level in Khabarovsk, with the most vulnerable group being teenagers, the reproductive potential of the region. Key words: vitamin D, children, newborns, primary school children, teenagers
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