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New Canadian knowledge on masks effectiveness

We estimate the impression of masks mandates and different non-pharmaceutical interventions (NPI) on COVID-19 case progress in Canada, together with laws on companies and gatherings, college closures, journey and self-isolation, and long-term care properties. We partially account for behavioral responses utilizing Google mobility knowledge. Our identification method exploits variation within the timing of indoor face masks mandates staggered over two months within the 34 public well being areas in Ontario, Canada’s most populous province. We discover that, within the first few weeks after implementation, masks mandates are related to a discount of 25 % within the weekly variety of new COVID-19 circumstances. Additional evaluation with province-level knowledge supplies corroborating proof. Counterfactual coverage simulations recommend that mandating indoor masks nationwide in early July might have decreased the weekly variety of new circumstances in Canada by 25 to 40 % in mid-August, which interprets into 700 to 1,100 fewer circumstances per week.

That is from a new NBER working paper by Alexander Karaivano, Shih En Lu, Hitoshi Shigeoka, Gong Chen, and Stephanie Pamplona.

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