Per Cochrane, not enough data from the right kind of studies to make any conclusion.

New York Times, Zeynep Tufekci, March 10, 2023

https://www.nytimes.com/2023/03/10/opinion/masks-work-cochrane-study.html

>The debate over masks’ effectiveness in fighting the spread of the coronavirus intensified recently when a respected scientific nonprofit said its review of studies assessing measures to impede the spread of viral illnesses found it was “uncertain whether wearing masks or N95/P2 respirators helps to slow the spread of respiratory viruses.”
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>Now the organization, Cochrane, says that the way it summarized the review was unclear and imprecise, and that the way some people interpreted it was wrong.
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>“Many commentators have claimed that a recently updated Cochrane review shows that ‘masks don’t work,’ which is an inaccurate and misleading interpretation,” Karla Soares-Weiser, the editor in chief of the Cochrane Library, said in a statement.
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>“The review examined whether interventions to promote mask wearing help to slow the spread of respiratory viruses,” Soares-Weiser said, adding, “Given the limitations in the primary evidence, the review is not able to address the question of whether mask wearing itself reduces people’s risk of contracting or spreading respiratory viruses.”.
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>. . .
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>She said that “this wording was open to misinterpretation, for which we apologize,” and that Cochrane would revise the summary.
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>Soares-Weiser also said, though, that one of the lead authors of the review even more seriously misinterpreted its finding on masks by saying in an interview that it proved “there is just no evidence that they make any difference.” In fact, Soares-Weiser said, “that statement is not an accurate representation of what the review found.”