iFP Schools (mandate) VS WF Schools (no mandate) with similar vaccination rates and demographics found 0 significant difference in COVID case rates (IRR0.99,95%CI: 0.92-1.07)
Moreover, during a period of time when both school districts had similar masking policies, there was also no significant difference in student case rates among the nearly 24k (IRR 1.04; 95% CI: 0.92 to 1.16)
Read the paper here