Fig. 1.

Weighted self-reported weekly mask usage prevalence by country, (Weights adjust each country sample to their corresponding national population.) grouped by A) countries with consistently high face mask usage, B) countries that transitioned from low to high face mask usage, C) countries that had consistently low face mask usage, D) countries that showed irregular trends over time. Panel 1A) Mask usage for countries with consistently high face mask usage. Panel 1B) Mask usage for countries that transitioned from low face mask usage to high usage. Panel 1C) Mask usage for countries that had consistently low face mask usage. Panel 1D) Mask usage for countries that showed irregular trends over time