We’re still in the early days of understanding exact effectiveness. Few randomized control trials have been done. However, there’s some good meta-analysis done on the geographical level, in the US, Germany, and within hospital systems. You probably already believe this but please wear a mask. They aren’t a cure-all but they help.
Some data on mask effectiveness
Some data on mask effectiveness
Some data on mask effectiveness
We’re still in the early days of understanding exact effectiveness. Few randomized control trials have been done. However, there’s some good meta-analysis done on the geographical level, in the US, Germany, and within hospital systems. You probably already believe this but please wear a mask. They aren’t a cure-all but they help.