No. We have some idea of what works and what doesn't based on the effects as different countries rolled out different policies in different orders, see [0] for

No. We have some idea of what works and what doesn't based on the effects as different countries rolled out different policies in different orders, see [0] for a recent example. But specifically for schools, there just aren't enough data points. Instead they have to be clumped together with closing universities, since almost every country closed all forms of education at the same time. [0] https://www.medrxiv.org/content/10.1101/2020.05.28.20116129v3.full.pdf+html https://www.medrxiv.org/content/10.1101/2020.05.28.20116129v...