are there more sites like rationalground.com with data correlating masks with covid cases, hospitalizations or deaths?
https://rationalground.com/interactive-tool-masks-covid-19/
'The survey was conducted in the middle of July and v to July 15th through Sept 15th. The line shows a positive or negative correlation. If masks do indeed work you would expect to see a line sloping downward. Hover over the line to get your R-square and P values.'
HuffPO for keks