COVID-19 Pandemic and Vitamin D Levels in Children
Mia Hoffmann
2026-03-20
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The COVID-19 pandemic has far-reaching implications. The closures and long-term alterations in daily life have also affected the health situation of society. The journal "Nutrients" published a study by Polish scientists that demonstrates the changes in the vitamin D concentration in the blood of Warsaw children during the pandemic.
The impact of the COVID-19 pandemic on vitamin D concentrations in Polish children: A comparative analysis of pre-pandemic and pandemic periods based on 1,472 pediatric patient records
A research team led by Dr. A. Rustecka from the Military Institute of Medicine in Warsaw conducted a comprehensive statistical analysis to evaluate differences in serum 25-hydroxyvitamin D [25(OH)D] concentrations among children residing in Warsaw. The study encompassed a total of 1,472 participants ranging in age from one month to 18 years. Blood samples were systematically collected over a 25-month period—from January 2019 through the end of February 2021. The methodology involved dividing the sample into two distinct temporal cohorts: the **pre-pandemic cohort** (measurements taken between January 2019 and February 2020) and the **pandemic cohort** (measurements conducted from March 2020 to February 2021). Clinical reference standards for vitamin D were applied, with an optimal range defined as 30–50 ng/ml, suboptimal levels categorized as 20–30 ng/ml, and concentrations below 20 ng/ml identified as frank deficiency.
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