open access

Vol 62, No 3 (2011)
Original papers
Published online: 2011-06-29
Submitted: 2013-02-15
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Vitamin D deficiency prevalence in summer compared to winter in a city with high humidity and a sultry climate

Zahra Kashi, Fatemeh sima Saeedian, Ozra Akha, Mohamad ali Hydari Gorgi, Saydeh fatemeh Emadi, Hamidreza Zakeri
Endokrynologia Polska 2011;62(3):249-251.

open access

Vol 62, No 3 (2011)
Original papers
Published online: 2011-06-29
Submitted: 2013-02-15

Abstract

Background: Vitamin D deficiency is high in winter because of reduced exposure to sunlight. It seems that in places with high humidity and a sultry climate, exposure to sunlight in summer can be low too. This study was designed to determine the vitamin D deficiency prevalence in Sari, a city with a high humidity climate at the end of summer, and compare it to winter.
Material and methods: This cross-sectional study was carried out on men and women aged 10 to 70. Clustered blood samples were received from 351 subjects who participated in this study toward the end of summer, and in winter. The levels of serum vitamin D, calcium, phosphorus, alkaline phosphatase and PTH were measured. T test and X2 were used for data analysis.
Results: 351subjects (66.4% women, 33.6% men) aged 11 to 69 (mean age &#177; SD 37.11 &#177; 12.6) participated in the study. The mean 25-(OH) D concentration in summer was 13.41 &#177; 13, and in winter it was 11.7 &#177; 11, and the difference was statistically significant (p < 0.02). The prevalence of 25-OHvitamin D deficiency was 87.5% (307) in winter and 78.6% (276) in summer (p < 0.05).
Conclusion: This study shows that although in this area with a high humidity climate, seasonal variation of vitamin D is statistically significant, the prevalence of Vitamin D insufficiency is as high in summer as in winter. (Pol J Endocrinol 2011; 62 (3): 249&#8211;251)

Abstract

Background: Vitamin D deficiency is high in winter because of reduced exposure to sunlight. It seems that in places with high humidity and a sultry climate, exposure to sunlight in summer can be low too. This study was designed to determine the vitamin D deficiency prevalence in Sari, a city with a high humidity climate at the end of summer, and compare it to winter.
Material and methods: This cross-sectional study was carried out on men and women aged 10 to 70. Clustered blood samples were received from 351 subjects who participated in this study toward the end of summer, and in winter. The levels of serum vitamin D, calcium, phosphorus, alkaline phosphatase and PTH were measured. T test and X2 were used for data analysis.
Results: 351subjects (66.4% women, 33.6% men) aged 11 to 69 (mean age &#177; SD 37.11 &#177; 12.6) participated in the study. The mean 25-(OH) D concentration in summer was 13.41 &#177; 13, and in winter it was 11.7 &#177; 11, and the difference was statistically significant (p < 0.02). The prevalence of 25-OHvitamin D deficiency was 87.5% (307) in winter and 78.6% (276) in summer (p < 0.05).
Conclusion: This study shows that although in this area with a high humidity climate, seasonal variation of vitamin D is statistically significant, the prevalence of Vitamin D insufficiency is as high in summer as in winter. (Pol J Endocrinol 2011; 62 (3): 249&#8211;251)
Get Citation

Keywords

vitamin D deficiency; seasonal variation; sultry climate; high humidity

About this article
Title

Vitamin D deficiency prevalence in summer compared to winter in a city with high humidity and a sultry climate

Journal

Endokrynologia Polska

Issue

Vol 62, No 3 (2011)

Pages

249-251

Published online

2011-06-29

Bibliographic record

Endokrynologia Polska 2011;62(3):249-251.

Keywords

vitamin D deficiency
seasonal variation
sultry climate
high humidity

Authors

Zahra Kashi
Fatemeh sima Saeedian
Ozra Akha
Mohamad ali Hydari Gorgi
Saydeh fatemeh Emadi
Hamidreza Zakeri

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