Methods
NHANES III is a program of studies conducted by the National Center for Health Statistics designed to assess the prevalence of disease, disease risk factors, and nutritional status of civilian non-institutionalized US population. Linked mortality information through April 26, 2022, was provided by the National Center for Health Statistics (NCHS) of the Centers for Disease Control and Prevention (CDC). The NCHS of CDC conducts statistical and epidemiological activities under the authority granted by the Public Health Service Act (42 U.S.C. ยง 242k). NCHS survey data are protected by Federal confidentiality laws. Data collection was reviewed and approved by the National Center for Health Statistics Research Ethics Review Board and signed informed consent forms were obtained from study participants. All data in this study are publicly available at https://www.cdc.gov/nchs/nhanes/index.htm.