die_kuestenwache t1_j9sktov wrote on February 24, 2023 at 6:39 AM

Well, you can test in a lab if masks worn properly or a good approximation of that filter out aerosols or dust and to what degree. As for "as worn in real life" is something you can also not control for in a double blind study. These studies have to exclude confounding variables as well as possible, too. You will have to do population studies, I don't see a way around that.

DenebianSlimeMolds OP t1_j9vg02i wrote on February 24, 2023 at 9:07 PM

the claim is made that unless you are testing masks in real life, for example on kids going to school and playing all day, sometimes wearing masks and sometimes not, you really aren't testing masks in any meaningful way that matters in terms of how kids will use them.