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Effectiveness of Public Health Measures in Reducing the Incidence of COVID-19, SARS-CoV-2 Transmission, and COVID-19 Mortality

Only 8 of 35 studies could be included in the meta-analysis. Combined, these indicate a 25% risk reduction for physical distancing, 53% for mask-wearing, and 53% for hand washing. The accompanying BMJ editorial explores the possible reasons for the findings and the oddity that so little quality research is available on such an important topic.

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