I looked at three links here: https://www.ncbi.nlm.nih.gov/pubmed/19216002 https://www.ncbi.nlm.nih.gov/pubmed/19216002 Is laughably underpowered. 2 people go

I looked at three links here: https://www.ncbi.nlm.nih.gov/pubmed/19216002 https://www.ncbi.nlm.nih.gov/pubmed/19216002 Is laughably underpowered. 2 people got a cold in one group, 1 in the other. There's nothing to derive from this. bin-Reza is a review that does not agree with your statement. Radonovich et al compares N95 and surgical masks, and finds no difference between those. One has to actually read and critically evaluate scientific papers to learn something.