@HalCranmer @IslandPirates77 @elaine_hali @ChrisACole @J_D_Klein Roughly 95% of the people in the study were using masks at least some of the time. You would expect more infections in a group 19 times larger, even with significant reduction in risk ratio (which is what the study found).
@HalCranmer@IslandPirates77@elaine_hali@ChrisACole@J_D_Klein研究中大约95%的人至少有一段时间使用口罩。即使风险比显著降低（这是研究发现的），你也会预计19倍大的群体会出现更多感染。