Volume 18, Issue 3 (Autumn 2011)                   J Birjand Univ Med Sci. 2011, 18(3): 210-216 | Back to browse issues page

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1- Assistant professor, endocrinologist, Arak University of Medical Sciences , afsanehtalaeii@yahoo.com
2- Arak University of Medical Sciences, Arak, Iran
Abstract:   (14426 Views)
Background and Aim: Vitamin D has a basic role in bone development and metabolism. Regarding high prevalence of vitamin D deficiency in Iran, we aimed to investigate its point prevalence in Arak, Iran and determine a cut-off point for vitamin D deficiency in the region. Materials and Methods: In a cross-sectional study,420 adolescents (220 girls, 200 boys) aged 10-16 years old were selected using a multistage sampling. Plasma level of vitamin D and PTH were evaluated using radio immune assay and immuno radio metric assay, respectively. The relation between vitamin D and PTH was assessed through scatter diagram and the cut-off points for vitamin D deficiency were detected accordingly. The prevalence of vitamin D deficiency in different cut-off points, as well as, the associated factors were analyzed using SPSS 15.00. Student t-test was used to compare the girls and the boys. Results: Considering 25(OH) vit-D level <20 ng/ml as vitamin D deficiency, 84% of the students were vitamin D deficient (99.1% of girls, 66.5% of boys) (P=0.001). Scatter diagram showed three cut-off points for vitamin D deficiency as 25(OH) vit-D level < 13, 21, 33 ng/ml. Conclusion: Vitamin D deficiency is more prevalent among girls than boys and increases with increased weight (P=0.05). A cut-off point of 25(OH) vit-D <13 ng/ml is recommended for detecting vitamin D deficiency in Arak, Iran.
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Type of Study: Original Article | Subject: Nutrition
Received: 2010/12/6 | Accepted: 2011/11/9 | ePublished: 2016/03/10