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Gotta have a control cohort within same school if you want to do actual science.

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Said this on the Tweet from Rob Hughes but given how fickle Twitter can be a times figured I"d post here too..as I'd like to hear more form all sides on this.

First I'm seeing any data like this as have been content to listen to whatever the experts decides. Thanks for sharing. Are there studies like this that would include the newer variants?

Well I did see a graph of Florida districts a day ago on facebook...so I don't have a link, where the unmasked school had 8% of its students out for testing positive versus 4% for a masked school. I get that that data can't conclusively say masks help but think its worth noting.

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The Arizona study also had a short time period - 1.5 months.

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It's quite concerning how many 'scientists' quote this laughably bad CDC 'study' approvingly with zero attention to the gaping holes in it.

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As you rightly point out, the raw number of cases is not known - know only 2 or more - but perhaps equally importantly, there is no consideration of *case rate*. The student populations in these schools vary widely. 2 cases in a 100-person school is far different than 2 cases in a 1,000-person school, yet both are categorized identically.

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