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Meta-Analysis
. 2021 Jul;49(7):900-906.
doi: 10.1016/j.ajic.2020.12.007. Epub 2020 Dec 19.

Face masks to prevent transmission of COVID-19: A systematic review and meta-analysis

Yanni Li  1 , Mingming Liang  2 , Liang Gao  3 , Mubashir Ayaz Ahmed  4 , John Patrick Uy  4 , Ce Cheng  5 , Qin Zhou  6 , Chenyu Sun  7
Affiliations
Meta-Analysis

Face masks to prevent transmission of COVID-19: A systematic review and meta-analysis

Yanni Li et al. Am J Infect Control. 2021 Jul.

Abstract

Background: Based on the status of the COVID-19 global pandemic, there is an urgent need to systematically evaluate the effectiveness of wearing masks to protect public health from COVID-19 infection.

Methods: The Preferred Reporting Items for Systematic Reviews and Meta-Analysis statement was consulted to report this systematic review. We conducted a systematic review and meta-analysis to evaluate the effectiveness of using face masks to prevent the spread of SARS-CoV-2. Relevant articles were retrieved from PubMed, Web of Science, ScienceDirect, Cochrane Library, and Chinese National Knowledge Infrastructure, VIP (Chinese) database. There were no language restrictions. This study was registered with PROSPERO under the number CRD42020211862.

Results: A total of 6 studies were included, involving 4 countries, after a total of 5,178 eligible articles were searched in databases and references. In general, wearing a mask was associated with a significantly reduced risk of COVID-19 infection (OR = 0.38, 95% CI: 0.21-0.69, I2 = 54.1%). For the healthcare workers group, masks were shown to have a reduced risk of infection by nearly 70%. Sensitivity analysis showed that the results were robust.

Conclusions: The results of this systematic review and meta-analysis support the conclusion that wearing a mask could reduce the risk of COVID-19 infection. Robust randomized trials are needed in the future to better provide evidence for these interventions.

Keywords: Healthcare worker; Personal protection equipment; Prevention; Respiratory virus; SARS-CoV-2.

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Figures

Fig 1
Fig 1
Flow diagram of the study search and selection process.
Fig 2
Fig 2
Funnel plots of face masks and COVID-19.
Fig 3
Fig 3
Forest plot for the random-effect meta-analysis.
Fig 4
Fig 4
Forest plots of the fixed-effect of masks on COVID-19 between HCW and non-HCW.
See this image and copyright information in PMC

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