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.