The Korea National Health and Nutrition Examination Survey (KNHANES) is a national surveillance system that has been assessing the health and nutritional status of Koreans since 1998. Conducted by the Korea Centers for Disease Control and Prevention (KCDC), it is a nationally representative cross-sectional survey that collects data on socioeconomic status, health-related behaviors, quality of life, healthcare utilization, anthropometric measures, biochemical and clinical profiles, and dietary intakes. The survey includes three components: health interview, health examination, and nutrition survey. The health interview and examination are conducted by trained medical staff at a mobile examination center, while dieticians visit participants' homes for the nutrition survey. KNHANES provides statistics for health-related policies in Korea and serves as research infrastructure for studies on risk factors and diseases, supporting over 500 publications. KCDC also provides annual workshops for data users and publishes Korea Health Statistics annually. Microdata are publicly available through the KNHANES website. KNHANES is an ongoing surveillance system that assesses the health and nutritional status of Koreans, monitors trends in health risk factors and the prevalence of major chronic diseases, and provides data for the development and evaluation of health policies and programs. It was first established in 1998 based on the National Health Promotion Act. The survey is conducted annually, targeting nationally representative non-institutionalized civilians. Each survey year includes a new sample of about 10,000 individuals aged 1 year and over. The survey includes three components: health interview, health examination, and nutrition survey. The health interview and examination are conducted by trained medical staff at the mobile examination center, while dieticians visit participants' homes for the nutrition survey. The surveys collect detailed information on socioeconomic status, health behaviors, quality of life, healthcare utilization, anthropometric measures, biochemical profiles, dental health, vision, hearing, bone density, X-ray test results, food intake, and dietary behavior. KNHANES has been conducted in 1998, 2001, 2005, 2007–09, and 2010–12. In 2013, the sixth KNHANES (2013–15) was started. The survey frequency was redesigned from once every 3 years to every year to provide timely health statistics. The 2011 KNHANES response rate was 76.1% for the health interview and examination survey and 82.4% for the nutrition survey. KNHANES data are widely used by governmental organizations and researchers. The Korean Government has revised national health plans and established the National Health Plan 2020. KNHANES has supported health statistics on more than half of target indicators for HP 2020 goals. KNHANES has been used for the development of KoreanThe Korea National Health and Nutrition Examination Survey (KNHANES) is a national surveillance system that has been assessing the health and nutritional status of Koreans since 1998. Conducted by the Korea Centers for Disease Control and Prevention (KCDC), it is a nationally representative cross-sectional survey that collects data on socioeconomic status, health-related behaviors, quality of life, healthcare utilization, anthropometric measures, biochemical and clinical profiles, and dietary intakes. The survey includes three components: health interview, health examination, and nutrition survey. The health interview and examination are conducted by trained medical staff at a mobile examination center, while dieticians visit participants' homes for the nutrition survey. KNHANES provides statistics for health-related policies in Korea and serves as research infrastructure for studies on risk factors and diseases, supporting over 500 publications. KCDC also provides annual workshops for data users and publishes Korea Health Statistics annually. Microdata are publicly available through the KNHANES website. KNHANES is an ongoing surveillance system that assesses the health and nutritional status of Koreans, monitors trends in health risk factors and the prevalence of major chronic diseases, and provides data for the development and evaluation of health policies and programs. It was first established in 1998 based on the National Health Promotion Act. The survey is conducted annually, targeting nationally representative non-institutionalized civilians. Each survey year includes a new sample of about 10,000 individuals aged 1 year and over. The survey includes three components: health interview, health examination, and nutrition survey. The health interview and examination are conducted by trained medical staff at the mobile examination center, while dieticians visit participants' homes for the nutrition survey. The surveys collect detailed information on socioeconomic status, health behaviors, quality of life, healthcare utilization, anthropometric measures, biochemical profiles, dental health, vision, hearing, bone density, X-ray test results, food intake, and dietary behavior. KNHANES has been conducted in 1998, 2001, 2005, 2007–09, and 2010–12. In 2013, the sixth KNHANES (2013–15) was started. The survey frequency was redesigned from once every 3 years to every year to provide timely health statistics. The 2011 KNHANES response rate was 76.1% for the health interview and examination survey and 82.4% for the nutrition survey. KNHANES data are widely used by governmental organizations and researchers. The Korean Government has revised national health plans and established the National Health Plan 2020. KNHANES has supported health statistics on more than half of target indicators for HP 2020 goals. KNHANES has been used for the development of Korean