A scatterplot showing the relationship between age and vaccination rates for booster shots (December) vs initial vaccination rates (March) for California counties. The March vaccination rates have a stronger relationship to age than the December booster rates.
Data for booster shots as of Dec. 5, 2021 and data for initial dose rate as of March 1, 2021, when doses of each type surpassed 6.7 million administered in California. Data is filtered to counties with 50,000+ residents.