The CDC Behavioral Risk Factor Surveillance System, the largest continuously conducted health survey in the world. 2,890,479 rows. Per row: state/territory, year, the survey question/topic (chronic conditions, smoking, drinking, obesity, exercise, preventive care, access to care), response breakdowns, and weighted prevalence with confidence intervals. ~400,000 adult phone interviews per year. The backbone of US state-level public-health surveillance.
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