• Tomas Pueyo, writing in his Uncharted Territories substack blog takes a good hard look at the Cochrane Library’s meta analysis of the “Physical interventions to interrupt or reduce the spread of respiratory viruses” by Dooley et al. used by some (e.g. Bret Stephens in the NYT) to erroneously conclude that mask mandates are ineffective. In reality, no such conclusion can be drawn from the Dooley review — the authors themselves state “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.” and “We are uncertain whether wearing masks or N95/P2 respirators helps to slow the spread of respiratory viruses based on the studies we assessed.” Pueyo does a good job of analyzing why this review does not provide any substantive evidence that mask mandates are ineffective.
