Korean J Fam Pract. 2018; 8(2): 307-310  https://doi.org/10.21215/kjfp.2018.8.2.307
The Relationship between Sleep Duration, Dietary Patterns and Obesity in Korean Adult Women
Sundong Ryu1, Seung-Pil Jung1,*, Keun-Mi Lee1, Hye-Shin Kim1, Seong-Hi Cheon1, Jun-Seok Hwang2
1Department of Family Medicine, Yeungnam University College of Medicine, Daegu; 2Institute of Social Science, Yeungnam University, Gyeongsan, Korea
Seung-Pil Jung
Tel: +82-53-620-3180, Fax: +82-53-654-2413
E-mail: spjung@yu.ac.kr
ORCID: http://orcid.org/0000-0002-1215-3624
Received: September 19, 2016; Revised: September 22, 2016; Accepted: September 27, 2016; Published online: April 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.
Abstract
Background: Obesity is an important social issue. Short sleep duration and vitamin D deficiency are known to be correlated with obesity. We investigated the associations of waist circumference (WC) with sleep duration, serum vitamin D level, and other factors in Korean adult women.
Methods: Data from the fifth Korean National Health and Nutrition Examination Survey conducted in 2010, 2011, and 2012 were used, and 1,912 women, aged >20 years, were included. The associations between the dependent (WC) and independent variables (sleep duration, health factors, and serum vitamin D level) were assessed using regression analysis and two-stage least squares analysis.
Results: The mean WC was 77.44 cm. A U-shaped relationship between sleep duration and WC was found (P＜0.05). WC was lowest when sleep duration was 8.58 hours a day. Serum vitamin D level was negatively associated with WC.
Conclusion: Sleep duration and serum vitamin D level were related to obesity in the Korean adult women in this study.
Keywords: Sleep Duration; Vitamin D; Waist Circumference; Abdominal Obesity
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