给楼上说没有依据的看一看

https://pmc.ncbi.nlm.nih.gov/articles/PMC10894839/

Child mask mandates for COVID-19: a systematic review

Johanna Sandlund ^1,, Ram Duriseti ², Shamez N Ladhani ^3,4, Kelly Stuart ⁵, Jeanne Noble ⁶, Tracy Beth Høeg ^7,8

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PMCID: PMC10894839  PMID: 38050026

 

Results

We screened 597 studies and included 22 in the final analysis. There were no randomised controlled trials in children assessing the benefits of mask wearing to reduce SARS-CoV-2 infection or transmission. The six observational studies reporting an association between child masking and lower infection rate or antibody seropositivity had critical (n=5) or serious (n=1) risk of bias; all six were potentially confounded by important differences between masked and unmasked groups and two were shown to have non-significant results when reanalysed. Sixteen other observational studies found no association between mask wearing and infection or transmission.

 

 

WHAT THIS STUDY ADDS

• In this systematic review, 16 studies found no effect of mask wearing on infection or transmission, while six studies reporting a protective association had critical or serious risk of bias.

• Because benefits of masking for COVID-19 have not been identified, it should be recognised that mask recommendations for children are not supported by scientific evidence.