@kknnaabb @_mbdr_ Right, it's not a preventative measure but it is one that you have to correct for if you want to evaluate preventative measures. Once you do that, the effect of preventive measures becomes strong, at least during the study period pre-vax (vax obviously important factor after).
@kknnaabb @_mbdr_ 是的，这不是一种预防措施，但如果你想评估预防措施，你必须纠正它。一旦你这样做了，预防措施的效果就会变得很强，至少在学习前的vax期间（vax显然是重要的因素之后）。