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Vitamin D Deficiency Still Growing

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03304795
Recruitment Status : Completed
First Posted : October 9, 2017
Last Update Posted : October 9, 2017
Information provided by (Responsible Party):
Han Seok Choi, DongGuk University

Brief Summary:

Vitamin D deficiency has become one of the most prevalent health problems in modern society. However, there has been no study that has reported the trend of vitamin D status in Asia. This study investigated the trend of vitamin D status in Korea between 2008 and 2014.

This study is based on a representative national database acquired from the Korea National Health and Nutrition Examination Surveys (KNHANES) conducted from 2008 to 2014. Serum 25-hydroxyvitamin D [25(OH)D] levels were measured by radioimmunoassay among those aged 10 yrs or older. The temporal change of vitamin D status will be statistically analyzed.

Condition or disease
Vitamin D Deficiency

Detailed Description:

Most epidemiologic studies that assessed vitamin D status in various populations have been performed in a cross-sectional design. Some studies from western countries have assessed the trends of vitamin D status over the past decades. However, there was no study that investigated the trend of vitamin D status in Asian population.

In the present study, an assessment of the seven-year trend of vitamin D status and the prevalence of vitamin D deficiency in the Korean population, based on the KNHANES conducted from 2008 to 2014 was performed.

The KNHANES is an ongoing surveillance system that has been conducted by the Division of Health and Nutrition Survey within the Korea Centers for Disease Control and Prevention to evaluate the health and nutritional status of the civilian non-institutionalized population of South Korea. Since the KNHANES was initiated in 1998, surveys for the KNHANES I (1998), KNHANES II (2001), KNHANES III (2005), KNHANES IV (2007-2009), KNHANES V (2010-2012), and KNHANES VI (2013-2015) have been executed, and the survey for KNHANES VII (2016-2018) is still in progress. The present study is based on the data acquired from the KNHANES IV-VI, conducted between 2008 and 2014. Among those participants, serum 25(OH)D levels were measured from 39,759 individuals (6,925 in 2008; 8,303 in 2009; 6,815 in 2010; 6,704 in 2011; 6,308 in 2012; 2,355 in 2013; and 2,349 in 2014) aged 10 years and older. Serum 25(OH)D concentration was categorized into 4 levels (<25, 25 to <50, 50 to <75, and ≥75 nmol/L) and the vitamin D deficiency was defined as the Serum 25 (OH) D concentration < 50 nmol/L.

Statistical analyses were conducted to evaluate the effects of participant characteristics (age, season, and residential region) on serum 25(OH)D concentrations, and the temporal change in the mean concentration of serum 25(OH)D over years 2008-2014.

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Study Type : Observational
Actual Enrollment : 39759 participants
Observational Model: Ecologic or Community
Time Perspective: Cross-Sectional
Official Title: Is Vitamin D Deficiency Still Growing? Seven-Year Trend in KNHANES 2008-2014
Actual Study Start Date : January 1, 2008
Actual Primary Completion Date : December 31, 2014
Actual Study Completion Date : December 31, 2014

Resource links provided by the National Library of Medicine

Drug Information available for: Vitamin D

Vitamin D deficiency
Serum 25-hydroxyvitamin D level is less than 50 nmol/L.
Serum 25-hydroxyvitamin D level is 50 nmol/L or greater.

Primary Outcome Measures :
  1. Vitamin D deficiency [ Time Frame: 2008-2014 ]
    Serum 25-hydroxyvitamin D level less than 50 nmol/L

Information from the National Library of Medicine

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Ages Eligible for Study:   10 Years and older   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
The KNHANES is an ongoing surveillance system to evaluate the health and nutritional status of the civilian non-institutionalized population of South Korea. The present study population is from the KNHANES 2008-2014. Among the participants in KNHANES 2008-2014, those aged 10 years and older with serum 25(OH)D levels were finally included (n=39,759).

Inclusion Criteria:

  • Participants in the KNHANES from 2008 to 2014
  • Participants who were examined for serum 25-hydroxyvitamin D level

Exclusion Criteria:

  • Participants without serum 25-hydroxyvitamin D level data
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Responsible Party: Han Seok Choi, Associate Professor, DongGuk University Identifier: NCT03304795    
Other Study ID Numbers: NRF-2015R1C1A1A01054333
First Posted: October 9, 2017    Key Record Dates
Last Update Posted: October 9, 2017
Last Verified: October 2017
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Han Seok Choi, DongGuk University:
Vitamin D
Temporal change
Additional relevant MeSH terms:
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Vitamin D Deficiency
Deficiency Diseases
Nutrition Disorders