Seasonality of vitamin D concentrations and the incidence of vitamin D deficiency in children and adolescents from central Poland

Joanna Smyczyńska; Urszula Smyczyńska; Renata Stawerska; Hanna Domagalska-Nalewajek; Andrzej Lewiński; Maciej Hilczer

doi:10.5114/pedm.2019.85814

eISSN: 2083-8441
ISSN: 2081-237X

Pediatric Endocrinology Diabetes and Metabolism

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Original paper

Seasonality of vitamin D concentrations and the incidence of vitamin D deficiency in children and adolescents from central Poland

Joanna Smyczyńska

¹

,

Urszula Smyczyńska

²

,

Renata Stawerska

¹

,

Hanna Domagalska-Nalewajek

¹

,

Andrzej Lewiński

^{1, 3}

,

Maciej Hilczer

^{1, 4}

Department of Endocrinology and Metabolic Diseases, Polish Mother’s Memorial Hospital – Research Institute, Lodz, Poland
Department of Biostatistics and Translational Medicine, Medical University of Lodz, Poland
Department of Endocrinology and Metabolic Diseases, Medical University of Lodz, Poland
Department of Paediatric Endocrinology, Medical University of Lodz, Poland

Pediatr Endocrinol Diabetes Metab 2019; 25 (2): 54-59

DOI: https://doi.org/10.5114/pedm.2019.85814

Online publish date: 2019/06/29

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AMA

Smyczyńska J, Smyczyńska U, Stawerska R, Domagalska-Nalewajek H, Lewiński A, Hilczer M. Seasonality of vitamin D concentrations and the incidence of vitamin D deficiency in children and adolescents from central Poland. Pediatric Endocrinology Diabetes and Metabolism. 2019;25(2):54-59. doi:10.5114/pedm.2019.85814.

APA

Smyczyńska, J., Smyczyńska, U., Stawerska, R., Domagalska-Nalewajek, H., Lewiński, A.,  & Hilczer, M. (2019). Seasonality of vitamin D concentrations and the incidence of vitamin D deficiency in children and adolescents from central Poland. Pediatric Endocrinology Diabetes and Metabolism, 25(2), 54-59. https://doi.org/10.5114/pedm.2019.85814

Chicago

Smyczyńska, Joanna, Urszula Smyczyńska, Renata Stawerska, Hanna Domagalska-Nalewajek, Andrzej Lewiński,  and Maciej Hilczer. 2019. "Seasonality of vitamin D concentrations and the incidence of vitamin D deficiency in children and adolescents from central Poland". Pediatric Endocrinology Diabetes and Metabolism 25 (2): 54-59. doi:10.5114/pedm.2019.85814.

Harvard

Smyczyńska, J., Smyczyńska, U., Stawerska, R., Domagalska-Nalewajek, H., Lewiński, A.,  and Hilczer, M. (2019). Seasonality of vitamin D concentrations and the incidence of vitamin D deficiency in children and adolescents from central Poland. Pediatric Endocrinology Diabetes and Metabolism, 25(2), pp.54-59. https://doi.org/10.5114/pedm.2019.85814

MLA

Smyczyńska, Joanna et al. "Seasonality of vitamin D concentrations and the incidence of vitamin D deficiency in children and adolescents from central Poland." Pediatric Endocrinology Diabetes and Metabolism, vol. 25, no. 2, 2019, pp. 54-59. doi:10.5114/pedm.2019.85814.

Vancouver

Smyczyńska J, Smyczyńska U, Stawerska R, Domagalska-Nalewajek H, Lewiński A, Hilczer M. Seasonality of vitamin D concentrations and the incidence of vitamin D deficiency in children and adolescents from central Poland. Pediatric Endocrinology Diabetes and Metabolism. 2019;25(2):54-59. doi:10.5114/pedm.2019.85814.

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Introduction
Vitamin D3 [25(OH)D] deficiency is a significant problem in Polish children. In many regions of the world, 25(OH)D concentrations show seasonal variation and differences between boys and girls, due to seasonal differences in insolation, as well as different sociological and cultural factors.

The aim of the study
The aim of the study was to assess the seasonal variations of 25(OH)D concentrations and the incidence of vitamin D deficiency in children from central Poland.

Material and methods
The analysis comprised 1275 children, age 3–18 (11.2 ±4.0) years, with disorders of growing and/or puberty, obesity, and other complaints that could be related to endocrine diseases, except for ones with calcium-phosphorus imbalance, impaired parathyroid hormone secretion, and diseases that may influence vitamin D supply.

Results
Seasonal variability of 25(OH)D concentrations was observed with maximal levels in August and minimal in January and close relationship between 25(OH)D levels and insolation in the previous two months. In all the quarters, 25(OH)D concentrations were lower in girls than in boys and in older vs. younger children. The median value of 25(OH)D concentrations was below the lower limit of optimal range during the whole year. High incidence of 25(OH)D deficiency was observed (from 10.7% in August to 80.4% in January) together with low proportion of normal 25(OH)D levels (from 3.6% in January to 42.1% in August).

Conclusions
Our results are consistent with previous reports on inadequate vitamin D supplementation in Polish children and adolescents, pointing out the necessity to implement current recommendations concerning vitamin D supplementation and the need for further studies on the consequences vitamin D deficiency for health of children and adolescents, with special attention to the pleiotropic effects of vitamin D.

keywords:

Seasonality of vitamin D concentrations and the incidence of vitamin D deficiency in children and adolescents from central Poland

Joanna Smyczyńska 1 , Urszula Smyczyńska 2 , Renata Stawerska 1 , Hanna Domagalska-Nalewajek 1 , Andrzej Lewiński 1, 3 , Maciej Hilczer 1, 4

vitamin D3 [25(OH)D], vitamin D deficiency, seasonality, vitamin D supplementation

Joanna Smyczyńska

¹

,

Urszula Smyczyńska

²

,

Renata Stawerska

¹

,

Hanna Domagalska-Nalewajek

¹

,

Andrzej Lewiński

^{1, 3}

,

Maciej Hilczer

^{1, 4}