Condition-Dependent and Dynamic Impacts of Indoor Masking Policies for COVID-19 Mitigation: A Nationwide, Interrupted Time-Series Analysis.
Zeynep ErtemRichard E NelsonElissa M Schechter-PerkinsAmera Al-AmeryXilin ZhangWestyn Branch-EllimanPublished in: Clinical infectious diseases : an official publication of the Infectious Diseases Society of America (2023)
Masking policy had the greatest impact when COVID-19 risk was high and vaccine availability was low. When transmission risk decreases or vaccine availability increases, the impact was not significant regardless of mask policy type. Although often modeled as having a static impact, masking policy effectiveness may be dynamic and condition dependent.