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Which Face Masks are Most/Least Effective?
This study does not rank which masks are most/least effective. The authors clearly laid this out multiple times in the original study:
I'm not a statistician, but isn't it technically improper to rank the masks in this manner since many of the masks have mean and standard deviations so close to each other as to have no statistically significant difference? For example, the Valved N95 and Cotton 4 mask have mean values really close to each other and their standard deviations both encompass each others means, such that we can't really know based on this test design if one of them is really any better than the other due to the variability? Again, I'm not a statistician, but instead ranking them by groups of masks with similar effectiveness levels may be more accurate.
Thanks for the breakdown. I wish the study would have specified if the cotton was of the “tightly woven” kind. I recently acquired a cotopaxi 2-layer which claims to use tight weave cotton.
My bandana mask has 9 layers plus a vacuum cleaner bag material filter since I've read that that material is one of the best filter materials and a wire frame to hug to my face and keep my glasses unfogged..
Wow, the valved masks aren't as sociopathic as they seemed.
Dang it, I wear the gaiter strechy material one. It's so much more comfortable than anything else. But I guess I'm not helping anyone.