![]() Also the Statistics Korea (KOSTAT) links and provides the Cause of Death Statistics and researcher’s data. In Korea, the National Health Insurance Service (NHIS) and the Health Insureance Review and Assessment Service (HIRA) provides linked dataset on diseases, healthcare service utilization, and health examination information and the data collected by researchers upon their requests. Similarly, data from the Canadian Community Health Survey have been linked to the Canadian Death Database, the Historical Tax Summary file, and the Longitudinal Immigration Database. In Australia, National Health Survey data are linked to Multi-Agency Data Integration Project data, and the linked dataset is used for studies on the relationship between health and healthcare services. In the United States, the National Health Interview Survey and the National Health and Nutrition Examination Survey provide researchers with the data linked to Medicare and Medicaid Services data, including healthcare service utilization-related information and the National Death Index data that includes causeof-death information. To complement the limitations of a cross-sectional study and enhance the utilization of the survey data, other countries link national health survey data to healthcare service utilization and cause of death data, and use these linked datasets in various studies. However, some limitations make it difficult to identify the directionality of the relationship between the health behaviors and nutritional status and chronic diseases due to the characteristics of a cross-sectional study. In addition, data from the KNHANES are made available to the public to be used as a data source for various epidemiologic studies. The KNHANES is being used as the basis for health policy establishment and evaluation. The Korea Disease Control and Prevention Agency (KDCA) has annually conducted the Korea National Health and Nutrition Examination Survey (KNHANES) to assess the health and and health-related behaviors of Korean population based on article 16 of the National Health Promotion Act. The linked dataset was made available through the Research Data Center of the KDCA after a review of the research proposal, and will be made available after periodical updates. ![]() In the linked dataset, the total death rate was 6.6%, of which neoplasms accounted for the highest death rate (32.1%), followed by circulatory system disease (22.7%) and respiratory system disease (11.5%). ![]() The linkage rate between 2007-2015 National Health and Nutrition Examination Survey and 2007-2019 Cause of Death Statistics was 97.1%. The KNHANES data were linked to the Cause of Death Statistics based on resident registration numbers for subjects aged 19 years or older who agreed to link the data. To utilize KNHANES data to studies of mortality risk factors, the Korea Disease Control and Prevention Agency (KDCA) constructed a database linking KNHANES data to cause-of-death statistics in Statistics Korea, made available to researchers since 2020. The Korea National Health and Nutrition Examination Survey (KNHANES) is a national health survey that is conducted annually to assess the health and and health-related behaviors of Korean population. A detailed procedure is described in the ‘Guidebook for Korea National Health and Nutrition Examination Survey Linked Cause of Death data’ on the KNHANES homepage (). ![]() After reviewing the analysis results, the KDCA sends them to the researcher by e-mail. The researcher then visits the Research Data Center in the KDCA, performs the analysis, and submits a request to transfer the results out of the center. Thereafter, the KDCA uploads the linked dataset from KOSTAT to the Research Data Center. The KDCA then sends the required KNHANES raw data to the KOSTAT, and KOSTAT links this to the appropriate the Cause of Death data. Here, we briefly explain the procedure for providing the linked dataset: a researcher first submits a research proposal to the KDCA for review and requests the KOSTAT Microdata Integrated Service system for linking to the Cause of Death data following review. The linked dataset was made available after reviewing the relevant research proposals. ![]()
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