This long Twitter thread from a researcher is partly about the object-level question of mask effectiveness, but more interesting to me as a look at the meta-level question of how to evaluate the effectiveness of an intervention that’s poorly suited to randomized controlled trials.
LONG THREAD on masks. Mute if not interested.
— Trisha Greenhalgh (@trishgreenhalgh) July 11, 2021
Do masks work? Why do some people claim they don’t work? Do they cause harm? What kinds of masks should we wear? How does masking need to change now we know that Covid is airborne? When can we stop wearing them?
Get your popcorn.
1/