Assessing effective mask use by the public in two countries: an observational study.
Clare L AtzemaIvona MostaracDana ButtonPeter C AustinArshia Pedram JavidanLauren WintraubAllen LiRaumil V PatelDaniel Dongjoo LeeNathaniel P LathamEric A LathamPatrick C M BrownRita D SomogyiAlex ChangHuong NguyenSara BuerkBin ChenTristen ZimmermanTrevor R FunariCameron ColbertBory KeaPublished in: BMJ open (2021)
Mandatory mask use was associated with a large increase in mask-wearing. Despite 14% of them wearing their masks incorrectly, mask users had a large reduction in the mean number of breaches (disease transmission opportunities). The elderly and transit users may warrant public health interventions aimed at improving mask use.