This study was conducted to validate a food frequency questionnaire (FFQ) to assess vitamin K intake in clinical and research settings based on data from the Fifth Korea National Health and Nutrition Examination Survey (KNHANES V). We collected a subset of data on informative food items using the 24-hour recall method from adults aged 19 to 64 years from KNHANES V. The cumulative percent contri...

BACKGROUND Tinnitus is a common condition and frequently can be annoying to affected individuals. We investigated the prevalence and associated factors for tinnitus in South Korea using the data from the Korea National Health and Nutrition Examination Surveys (KNHANES) during 2009-2011. METHODS KNHANES is a cross-sectional survey of the civilian, non-institutionalized population of South Kore...

We would like to thank Dr. Young Ki Lee and Professor Dong Yeob Shin for reading our article and providing insightful comments regarding our study. In our article published in volume 32, issue 1 of Endocrinology and Metabolism, we reported that the reference interval of thyroid stimulating hormone (TSH) in the Korean population was between 0.62 and 6.68 mIU/L, which is higher than that of Weste...

BACKGROUND To evaluate and analyse the factors associated with health-related quality of life (HR-QoL) in the Korean population aged 50 years and older. METHODS We used data obtained from the fourth and fifth Korea National Health and Nutrition Examination Survey (KNHANES IV-V) 2007-2012, a national, cross-sectional health examination and survey, for which representative data on the health, n...

BACKGROUND We compared the association between economic status and the prevalence of diabetes mellitus (DM) using large nationwide datasets covering the previous 10 years in Korea. METHODS We analyzed the association between economic status and DM using Korean National Health and Nutrition Examination Survey (KNHANES) data from 2001 to 2010 weighted to represent the Korean population between ...

BACKGROUND The Korea National Health and Nutrition Examination Survey (KNHANES) III (2005) reported that 22.9% of individuals with diabetes have a glycated hemoglobin (HbA1c) <6.5% and that 43.5% have an HbA1c <7%. We investigated the levels of glycemic control and the factors associated with glycemic control using data from the KNHANES V (2010 to 2012). METHODS Subjects with diabetes diagnos...

BACKGROUND AND OBJECTIVE Few studies have examined the natural course of early COPD. The aim of this study was to observe the natural course of early COPD patients. We also aimed to analyze medical utilization and costs for early COPD during a 6-year period. METHODS Patients with early COPD were selected from Korean National Health and Nutrition Examination Survey (KNHANES) data. We linked th...

BACKGROUND Depressive symptoms accompanied by chronic obstructive pulmonary disease (COPD) can be influenced by socioeconomic status, associated chronic diseases and the current smoking status. This study was conducted to assess factors that are associated with depressive symptoms accompanied by COPD, using the data obtained from the Korea National Health and Nutritional Survey (KNHANES) conduc...

OBJECTIVES The aim of this study is to find the association between mothers' working hours and obesity of their children according to children's age and gender. METHODS This study used data from the second and third year of KNHANES IV and the first year in KNHANES V (2008-2010). We calculate odds ratio (OR) and 95% confidence interval (CI) by using survey logistic regression to assess associa...