Claim: According to a University of Bristol study, mask-wearing by large numbers of people can reduce the R rate by 0.25.
Fact-check: New study estimates mask wearing could cut R number by 25%, not 0.25 - Full Fact
Verdict: the study estimated that if everyone in a given population wore a mask it could lead to a median reduction of the r number of 25%, not a flat reduction of 0.25.
Organisation: Full Fact
Author: Tom Norton
Date published: 2021-07-14T00:00:00