Korean J Fam Pract. 2018; 8(5): 741-746  https://doi.org/10.21215/kjfp.2018.8.5.741
Trends of Urinary Excretion of Sodium in Korean Adults: Based on the Korea National Health and Nutrition Examination Survey 2009-2015
Yun Jae Han, Hyun Woo Kim*, Jung Hyun Kim, Dong Won Lee, Ji Hoon Jung, Sang Hyun Cho, Sun Whan Kim, Seung Jin Jung, Byung Shik Cho, Jae Hyun Youn
Department of Family Medicine, Hana General Hospital, Cheongju, Korea
Hyun Woo Kim
Tel: +82-43-230-6555, Fax: +82-43-230-5300
E-mail: jamesinfm@gmail.com
ORCID: http://orcid.org/0000-0002-9664-8324
Received: July 21, 2017; Revised: October 18, 2017; Accepted: October 24, 2017; Published online: October 20, 2018.
© The Korean Academy of Family Medicine. All rights reserved.

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 noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Background: Although the association between sodium intake and disease has been reported, no studies have assessed the trend of sodium excretion in urine in Koreans. We estimated daily urinary sodium excretion in Koreans and analyzed annual trends over time.
Methods: The 4th (2009), 5th (2010–2011), and 6th (2013–2014) National Health and Nutrition Examination Survey were used to extract data on adult subjects aged >20 years who did not take blood pressure medicine. The daily urinary sodium excretion was calculated using the E24UNA_K formula. The chi-square test was used to compare annual differences in analysis variables. Independent two-sample t-tests and analysis of variance were used to compare differences in 24-hour average urinary sodium excretion. Linear regression analysis was used to examine the increase according to year.
Results: The daily average urinary sodium excretion in Korean adults was 170.8±35.6 meq/day from 2009 to 2015. The daily average sodium excretion was 177.3±35.0 meq/day in 2009, 168.9±37.7 meq/day in 2010–2011, and 170.4±34.8 meq/day in 2014–2015. There were no significant increases between these periods (P-trend=0.459).
Conclusion: Although there were no increases in daily average sodium excretion, Koreans should try to reduce sodium intake because the daily average sodium consumption by Koreans is more than double the recommended allowance.
Keywords: Urinalysis; Creatinine; Nutrition Surveys
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