@bidens_diaper @J_D_Klein @HalCranmer Often there not just confounding but directly offsetting factors. Mask mandates and mask wearing often higher in higher risk communities or when spread increasing or when variants or surges anticipated.
Some good discussion here
https://twitter.com/zorinaq/st...
@bidens_尿布@J_D_Klein@HalCranmer通常不只是混淆因素，而是直接抵消因素。在高风险社区，或当传播增加，或当预期出现变异或激增时，口罩要求和口罩佩戴率往往更高。
这里有一些很好的讨论
https://twitter.com/zorinaq/st...