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For each HRMS round, a stratified random sample of adults ages 18-64 is drawn from the Knowledge Panel, a probability-based, nationally representative Internet panel maintained by Ipsos. The approximately 55,000 adults in the panel include households with and without Internet access. Panel members are recruited from an address-based sample frame derived from the United States Postal Service Delivery Sequence File, which covers 97 percent of United States households. The 2021 HRMS sample includes 9,067 nonelderly adults, including oversamples of low-and moderate-income adults by race and ethnicity and an oversample of adults ages 18 to 29.