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I'm no scientist, but my reading of Bret Stephens' commentary "Truth unmasked, at last" (Opinion Exchange, Feb. 24) disregards the fact that maybe, just maybe, the number of people contracting COVID might have been far greater if no one had worn a mask. Because there were so many unknowns during the pandemic, the use of masks was a legitimate effort to stem the tide of the virus. So many people, including Stephens, seem to be "experts" after the fact. When he writes that "states with mask mandates fared no better against COVID than those without," one has to wonder what those numbers might have been had no one worn a mask. A number of the things that seem to have motivated Stephens to write this article appear at its end — the first motive being a chance to attack and discredit the Centers for Disease Control and Prevention, with the second motive being that the anti-mask people should be seen as courageous.
George Larson, Brooklyn Park
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The Feb. 24 Star Tribune ("Truth unmasked, at last") has done your readers a terrible disservice by failing to investigate this article about the Cochrane study. That study was horribly conducted and not worth the paper it was printed on, according to a Real Clear Science article, "Masks reduce the risk of spreading of COVID, despite a Cochrane review saying they don't," by C. Raina MacIntyre, Abrar Ahmad Chughtai, David Fisman and Trish Greenhalgh.
Even the Cochrane study authors concluded as follows: "The high risk of bias in the trials, variation in outcome measurement, and relatively low adherence with the interventions during the studies hampers drawing firm conclusions. ... There is uncertainty about the effects of face masks. The low to moderate certainty of evidence means our confidence in the effect estimate is limited, and that the true effect may be different from the observed estimate of the effect." In other words, the authors are even uncertain about their own conclusions.
The Real Clear Science article concluded: "There is strong and consistent evidence for the effectiveness of masks and (even more so) respirators in protecting against respiratory infections. Masks are an important protection against serious infections. Current COVID vaccines protect against death and hospitalization, but do not prevent infection well due to waning vaccine immunity and substantial immune escape from new variants. A systematic review is only as good as the rigor it employs in combining similar studies of similar interventions, with similar measurement of outcomes. When very different studies of different interventions are combined, the results are not informative."