@IslandPirates77 @elaine_hali @ChrisACole @J_D_Klein @HalCranmer Because when you break down by type of mask the number of participants drops in each subgroup so lower confidence in the result, particularly for cloth masks where the effect was smaller. In the study group, most people were using surgical or better.
@IslandPirates77@elaine_hali@ChrisACole@J_D_Klein@HalCranmer，因为当你按口罩类型分类时，每个亚组的参与者人数都会下降，因此对结果的信心较低，尤其是对效果较小的布口罩。在研究组中，大多数人使用外科手术或更好的方法。