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.
Every record in this dataset can be traced back to its primary source at https://www.cdc.gov/brfss/. Underlying content is a US federal government work (public domain under 17 USC §105); our derived data is licensed CC0 1.0.