dex scores have been slightly increased from 0.94 to 0.96 during 2007-2010. Male adults had higher EQ-5D index scores than female (0.96 vs. 0.92). Elderly (ageՆ60) had significantly lower EQ-5D index scores (score ranges: 0.02 to 0.11) than young adult (ageϭ19-29) after adjusting for other variables. EQ-5D index scores were significantly reduced by stroke (reduced by -0.10), arthritis (reduced by -0.05), cardiovascular disease (reduced by -0.04), and diabetes (reduced by -0.02). CONCLUSIONS: QOL in South Korean adults was significantly reduced by chronic diseases and age. Despite national efforts to detect and treat chronic diseases at early stage of disease, significant reduction in QOL due to chronic diseases still exist. It is emphasized the need for implementation of effective public health programs for decreased prevalence of chronic diseases.