Reply to Just received word that masks during game play are no longer required at the Soccerplex!

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[quote=Anonymous][quote=Anonymous][quote=Anonymous]Wasn’t there a study early on in the pandemic from a hospital in Boston that showed that COVID infections among staff went down dramatically when everyone (including nurses and doctors in non-COVID wards, visitors, admin) all wore masks?[/quote]

Yes: https://jamanetwork.com/journals/jama/fullarticle/2768533[/quote]

This is exactly the sort of study which is the opposite of good science.  It notes a correlation between mask wearing and test results (which could stem for dozens of different causes) and makes no attempt to control for any of the other variables.  Science would require two otherwise-identical populations with one group wearing masks and one not.  This study simply notes a correlation and equates it to causation.

In fact no special cause at all is required to explain the results, the test results amongst the health care worker population simply followed the normal infection curve of a respiratory disease.  The study notes that the health care workers' test rates fell ahead of the general population - but that is hardly surprising since one would expect a disease to spread and then decline amongst health care wrokers ahead of the general population.

How would you determine for sure whether the correlation resulting from this study is actually causation?  you would conduct a randomized controlled trial where two identical groups are exposed to identical conditions with the only difference being that one group wears masks and the other doesn't.  It turns out that fourteen such trials have been conducted.  Every single one of them revealed no measurable difference.

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