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Mask research is in the news again with headlines like "mask mandates don't work".
I'll write my views here on how we should think about mask-wearing based on the research summarized in #CochraneReview
[Only minimum statistical literacy required to follow the argument]
I'll write my views here on how we should think about mask-wearing based on the research summarized in #CochraneReview
[Only minimum statistical literacy required to follow the argument]
Different studies are designed to answer 3 related but *different* questions
1. Do masks work when people actually wear them?
vs
2. Do mask mandates work?
vs
3. Does softly encouraging mask-wearing work?
We have good evidence that #1 works (RCTs in hospitals, lab studies,...]
1. Do masks work when people actually wear them?
vs
2. Do mask mandates work?
vs
3. Does softly encouraging mask-wearing work?
We have good evidence that #1 works (RCTs in hospitals, lab studies,...]
To study the effect of mask-wearing in the real world, you have to first get people to wear masks.
The treatment can be a mandate or some encouragement.
That experiment can only answer
2. What is the effect of imposing a mandate?
or
3. What is the effect of encouragement?
NOT #1
The treatment can be a mandate or some encouragement.
That experiment can only answer
2. What is the effect of imposing a mandate?
or
3. What is the effect of encouragement?
NOT #1
