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- Timo Mitze, Reinhold Kosfeld, Johannes Rode, and Klaus Wälde.
- Department of Business and Economics, University of Southern Denmark, 5230 Odense, Denmark.
- Proc. Natl. Acad. Sci. U.S.A. 2020 Dec 22; 117 (51): 32293-32301.
AbstractWe use the synthetic control method to analyze the effect of face masks on the spread of COVID-19 in Germany. Our identification approach exploits regional variation in the point in time when wearing of face masks became mandatory in public transport and shops. Depending on the region we consider, we find that face masks reduced the number of newly registered severe acute respiratory syndrome coronavirus 2 infections between 15% and 75% over a period of 20 days after their mandatory introduction. Assessing the credibility of the various estimates, we conclude that face masks reduce the daily growth rate of reported infections by around 47%.Copyright © 2020 the Author(s). Published by PNAS.
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