Effectiveness of Surgical Face Masks in Reducing Acute Respiratory Infections in Non-Healthcare Settings: A Systematic Review and Meta-Analysis.

Front Med (Lausanne) · 2020 · PMC7546829 · PMID 33102503

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did not reach statistical significanceno p-value reported

This is because the protective effect of SMs did not reach statistical significance (95% CI 0.8–1.15), although it lowered odds of ARI incidence by 4% compared with non-usage (pooled OR 0.96, Figure 2 ).

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