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ObjectivesTo investigate the association between self‐reported sleep duration and serum vitamin D level in elderly Korean adults.
DesignCross‐sectional data analysis.
SettingKorean National Health and Nutrition Examination Survey 2010.
ParticipantsNoninstitutionalized adults aged 60 to 80 (N = 1,614).
MeasurementsThe confounding variables were serum 25‐hydroxy vitamin D level, age, sex, body mass...
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