Well, it depends on what you think is "strong" evidence. A 10% reduction doesn't seem very compelling, and when you introduce the more advanced statistical anal

Well, it depends on what you think is "strong" evidence. A 10% reduction doesn't seem very compelling, and when you introduce the more advanced statistical analysis, that hurts the case in my eyes. There are probably less disruptive ways to get a 10% reduction. I found that study from this meta study here: https://pubmed.ncbi.nlm.nih.gov/20092668/ https://pubmed.ncbi.nlm.nih.gov/20092668/ which reviews a lot of these studies for influenza. Note, however, that most of the studies only look at if the masks protect the individual, not whether masks stop the spread of influenza, but the evidence seems pretty inconclusive.