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Source publication
Objective:
This study aimed to verify vitamin D concentration in children and adolescents during the seasons of the year and to compare vitamin D concentration between children engaged in outdoor activities and those engaged in indoor activities.
Methods:
This is a cross-sectional study with a sample of 708 children and adolescents (aged 6-18 ye...
Context in source publication
Context 1
... to the Poisson regression, the proportion of participants with inadequate levels of vitamin D was 15% and 18% greater in the participants whose vitamin D was measured during spring and winter, respectively. Similarly, the proportion of children and adolescents with inadequate levels of vitamin D was 8% greater for those engaged in indoor activities (Table 2). 3 shows the mean concentration of vitamin D stratified by indoor and outdoor activities. ...Citations
... The primary source of vitamin D in humans is its synthesis in the skin, requiring sufficient exposure to UVB radiation, the source of which is sunlight. However, it is insufficient not only in our latitude but also in countries with higher insolation, at least during the autumn and winter [6][7][8][9]. Another important source of vitamin D is food products. ...
The aim of the study was to investigate the effects of seasonal variability of insolation, the implementation of new recommendations for vitamin D supplementation (2018), and the SARS-CoV-2 pandemic lockdown (2020) on 25(OH)D concentrations in children from central Poland. The retrospective analysis of variability of 25(OH)D concentrations during the last 8 years was performed in a group of 1440 children with short stature, aged 3.0–18.0 years. Significant differences in 25(OH)D concentrations were found between the periods from mid-2014 to mid-2018, from mid-2018 to mid-2020, and from mid-2020 to mid-2022 (medians: 22.9, 26.0, and 29.9 ng/mL, respectively). Time series models created on the grounds of data from 6 years of the pre-pandemic period and used for prediction for the pandemic period explained over 80% of the seasonal variability of 25(OH)D concentrations, with overprediction for the first year of the pandemic and underprediction for the second year. A significant increase in 25(OH)D concentrations was observed both after the introduction of new vitamin D supplementation guidelines and during the SARS-CoV-2 pandemic; however, the scale of vitamin D deficiency and insufficiency was still too high. Time series models are useful in analyzing the impact of health policy interventions and pandemic restrictions on the seasonal variability of vitamin D concentrations.
