Most papers are inconclusive, though the largest covid-era study showed benefits
-19 pandemic may be fading into history, but debate over disease-control policies remains fierce. In January Cochrane, a non-profit, published a meta-analysis on mask mandates, which did not detect statistically significant evidence of their effectiveness.
Why are people who disagree so strongly citing the same paper? Although Cochrane is often called the “gold standard”, its meta-analyses are only as good as the studies they combine. And the lack of reliable research conducted during the pandemic prevented Cochrane from reaching a definitive conclusion itself. This left ample evidence for both sides to cherry-pick.
These papers are of limited relevance to the debate over covid-era mandates, which applied to public places, not homes. But four of the other five trials, which asked participants to wear masks outside their homes, also failed to produce significant evidence in favour of masks—including one on 5,000 Danes amid the pandemic.
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