A very, very impressive cluster randomized trial. Very hard to do! See thread for findings.https://twitter.com/Jabaluck/status/1433036923610742789 …
Why? I was super skeptical a study like this could be done, but they did it by doing it ethically and (correctly) sacrificing statistical power. The statistical controls are really weak, to be honest, exactly because it is ethical.
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I respectfully, but strongly disagree that it is ethical. It is not.
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Why this study has not been conducted in communities close by Yale or Standford. Why did they chose Bangladesh. 4.8% of fully vaccinated people. Are there similar studies about HIV prevention with "no-intervention arms"?
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Also look at how wrong the policy makers were on what would work to nudge mask use. Gazillion dollars are being spent on what policy makers imagine people are (and they are usually wrong) and on that aspect, they have proper controls and show what works. Super valuable.
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We really do not need this to support masking and proper ventilation controls. We already have way more than we need about airborne transmission of Covid.
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