The Cochrane Library, a trusted source of health information, misled the public by prioritizing rigor over reality
The COVID-19 pandemic is ongoing, but in May officials ended its designation as a public health emergency. So it's now fair to ask if all our efforts to slow the spread of the disease—from masking, to hand washing, to working from home—were worth it. One group of scientists has seriously muddied the waters with a report that gave the false impression that masking didn't help.
Karla Soares-Weiser, the Cochrane Library's editor in chief, objected to such characterizations of the review. The report had not concluded that “masks don't work,” she insisted. Rather the review of studies of masking concluded that the “results were inconclusive.” A closer look at how the mask report confused matters is revealing. The study's lead author, Tom Jefferson of the University of Oxford, promoted the misleading interpretation. When asked about different kinds of masks, including N95s, he declared, “Makes no difference—none of it.” In another interview, he called mask mandates scientifically baseless.
The answer demonstrates a third issue with the Cochrane approach: how it defines evidence. The organization states that its reviews “identify, appraise and synthesize all the empirical evidence that meets pre-specified eligibility criteria.” The problem is what those eligibility criteria are. Another study found that states with mask mandates saw a significant decline in the rate of COVID spread within just days of mandate orders being signed. The authors concluded that in the study period—March 31 to May 22, 2020—more than 200,000 cases were avoided, saving money, suffering and lives.
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