Quote:
Originally Posted by G1911
The 2019 study I linked, from the CDC, used controls. 10 RCT's even. Why is it only now, after the narrative switch, that they cannot use controls?
With controls, they found that masks do no nothing to stop transmission (which was expected as this is not what these masks were made to do). After the narrative switch, they abandoned controls and now conclude the opposite. Why would I believe the unctrolled studies over the same groups controlled studies?
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Well for one you're in the middle of an active pandemic, pretty hard to set up an RCT for masks on a global basis.
They certainly discussed the RCTs in this section.
Reviews and RCTs of Mask Use for Other Respiratory Illnesses.
Also, they noted this:
The standard RCT paradigm is well suited to medical interventions in which a treatment has a measurable effect at the individual level and, furthermore, interventions and their outcomes are independent across persons comprising a target population.
By contrast, the effect of masks on a pandemic is a population-level outcome where individual-level interventions have an aggregate effect on their community as a system.
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