Prevalence of Vitamin D Deficiency according to Climate Conditions among a Nationally Representative Sample of Iranian Adolescents: the CASPIAN-III Study

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KELISHADI ROYA; QORBANI MOSTAFA; MOTLAGH MOHAMMAD ESMAEIL; HESHMAT RAMIN; POURSAFA PARINAZ; BAHREYNIAN MARYAM

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Journal: Journal of Pediatric Perspectives Year:2016 | Volume:4 | Issue:6 (30) Page(s): 1903-1910

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Title

Prevalence of Vitamin D Deficiency according to Climate Conditions among a Nationally Representative Sample of Iranian Adolescents: the CASPIAN-III Study

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Keywords

Children and adolescents

Climate

Iran

Vitamin D deficiency

Abstract

Background: Sunlight is the main source of vitamin D; therefore, environmental factors might have an important role in the high prevalence of hypovitaminosis D in children. This study aimed to assess the vitamin D status according to the Climate of the living area in a nationally representative sample of Iranian adolescents. Material and Methods: This nationwide cross-sectional survey was performed among a representative sample of 1, 095adolescents aged 10-18 years, selected by multistage cluster sampling method from 27 provinces of Iran. Serum 25-hydroxyvitamin D [25(OH) D] concentrations was compared in inhabitants of humid-rainy, cold-mountainous, and sunny regions. Results: Vitamin D deficiency was documented in 40% of participants including 40. 70% of boys and 39. 30% of girls. We found significant difference in 25(OH) D concentrations among participants living in the three different Climates of the living area (P<0. 05). The median inter-quartile range (IQR) level for 25(OH)D was lower in humid-rainy Climate: 11. 40 (18. 64). Hypovitaminosis D was more frequent in humid-rainy Climate (42. 30%), compared to other Climates; this difference was more prominent in urban areas (P<0. 05). Boys living in various Climates had significantly different levels of 25(OH) D(P<0. 05), however this figure was not significantly different for girls (P>0. 05). The highest frequency of hypovitaminosis D (45. 2%) was documented among boys living in humid-rainy regions. Conclusion: The high prevalence of hypovitaminosis D, notably among inhabitants of humid-rainy region underscores the necessity of implementing national preventive strategies. This is of great importance especially in regions with lower exposure to sunlight.

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APA: Copy

KELISHADI, ROYA, MOTLAGH, MOHAMMAD ESMAEIL, HESHMAT, RAMIN, POURSAFA, PARINAZ, & BAHREYNIAN, MARYAM. (2016). Prevalence of Vitamin D Deficiency according to Climate Conditions among a Nationally Representative Sample of Iranian Adolescents: the CASPIAN-III Study. INTERNATIONAL JOURNAL OF PEDIATRICS, 4(6 (30)), 1903-1910. SID. https://sid.ir/paper/337359/en

Vancouver: Copy

KELISHADI ROYA, MOTLAGH MOHAMMAD ESMAEIL, HESHMAT RAMIN, POURSAFA PARINAZ, BAHREYNIAN MARYAM. Prevalence of Vitamin D Deficiency according to Climate Conditions among a Nationally Representative Sample of Iranian Adolescents: the CASPIAN-III Study. INTERNATIONAL JOURNAL OF PEDIATRICS[Internet]. 2016;4(6 (30)):1903-1910. Available from: https://sid.ir/paper/337359/en

IEEE: Copy

ROYA KELISHADI, MOHAMMAD ESMAEIL MOTLAGH, RAMIN HESHMAT, PARINAZ POURSAFA, and MARYAM BAHREYNIAN, “Prevalence of Vitamin D Deficiency according to Climate Conditions among a Nationally Representative Sample of Iranian Adolescents: the CASPIAN-III Study,” INTERNATIONAL JOURNAL OF PEDIATRICS, vol. 4, no. 6 (30), pp. 1903–1910, 2016, [Online]. Available: https://sid.ir/paper/337359/en

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