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KMID : 1039620160060060586
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Korean Journal of Family Practice
2016 Volume.6 No. 6 p.586 ~ p.591
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Associations between Sleep Duration and Serum Vitamin D Level in Korean Women
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Kim Ji-Won
Lee Woo-Jin
Kweon Hyuk-Jung
Oh Eun-Jung
Ahn Ah-Leum
Lee Ji-Sun
Choi Jae-Kyung
Cho Dong-Young
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Abstract
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Background: Vitamin D deficiency and sleep disturbance are common problems in Korean women. The objective of this study was to investigate the association between self-reported sleep duration and serum vitamin D level in Korean women.
Methods: A cross-sectional data analysis was performed by using data from the 2013 Korean National Health and Nutrition Examination Survey. The confounding variables were serum 25-hydroxy vitamin D level, age, sex, body mass index, smoking history, alcohol consumption, menopausal status, depressive mood, self-reported daily sleep duration, physical activity, and daily sitting hours. Self-reported daily sleep duration was divided into four groups as follows; Q1 (≤4 hours), Q2 (5-6 hours), Q3 (7-8 hours), and Q4 (≥9 hours).
Results: The mean serum vitamin D levels of the subjects in the Q1, Q2, Q3, and Q4 groups were 12.96, 16.21, 15.50, and 15.72 ng/mL, respectively. In a multivariate linear regression analysis, the subjects in the Q2 (B=3.547, 95% confidence interval [CI]=1.655-5.438), Q3 (B=3.221, 95% CI=1.428- 5.013), and Q4 groups (B=2.910, 95% CI=0.422-5.399) had significantly higher serum vitamin D levels than the subjects in the Q1 group.
Conclusion: Shorter sleep duration (≤4 hours) may be associated with lower vitamin D levels in Korean women.
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KEYWORD
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Sleep Duration, Sleep, Vitamin D, Women
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