> It seems likely that in societies who followed the guidance strictly, there must have been _some_ reduction in infections. There are lots of Asian countries

> It seems likely that in societies who followed the guidance strictly, there must have been _some_ reduction in infections. There are lots of Asian countries where mask mandate compliance has been well over 95%. Still, you cannot point to a single instance there or anywhere else where the imposition of a mask mandate can be seen to have had any effect on case curves. The Bangladesh RCT which even mandate advocates like to refer to showed a 10% reduction in community transmission, with a 95% CI which overlapped "no effect".