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Recent Trends in Serum Vitamin D Levels among Korean Population: Korea National Health and Nutrition Examination Survey 2008~2014
Korean J Clin Geri 2018 Jun;19(1):55-62
Published online June 30, 2018;  https://doi.org/10.15656/kjcg.2018.19.1.55
Copyright © 2018 The Korean Academy of Clinical Geriatrics.

Seung-Jin Jung1, Yul-Hwangbo2, Ji-Hoon Jung1, Jihoon Kim1, Hyunwoo Kim1, Ku-Hyong Jeong1, Dong-Won Lee1, Sang-Hyun Cho1, Hyun-Woo Kim1

1Department of Family Medicine, Chung-ju Hana General Hospital, Cheongju, Korea; 2Center for Thyroid Cancer, National Cancer Center, Goyang, Korea
Received December 19, 2017; Revised March 9, 2018; Accepted March 16, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Background: There is insufficient data to analyze how the vitamin D status of the Koreans has changed over the years. The purpose of this study is to describe the trend of serum vitamin D concentration by using 25-hydroxyvitamin D [25(OH)D] concentrations measured from 2008 to 2014 (the 4th-6th period of KNHANES).
Methods: KNHANES conducted a survey on participants who were 10 years old or older and whose blood 25(OH)D concentration was measured from 2008 to 2014. In this study, linear regression analysis was used to assess blood 25(OH)D concentration trends and logistic regression analysis was used to assess prevalence trends.
Results: The mean serum 25(OH)D concentration of all age groups showed a statistically significant decrease. The serum 25(OH)D concentration of the twenties was the lowest in all the surveyed years and the serum 25(OH)D concentration of the forties showed the fastest declining trend. There was no significant increase in the prevalence of vitamin D deficiency in the group using dietary supplements.
Conclusion: The serum vitamin D level of Koreans has been decreasing for seven years. Vitamin D replacement through dietary supplements is needed in the high risk group of vitamin D deficiency.
Keywords : Vitamin D deficiency, Korea, Vitamin D
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June 2018, 19 (1)