She and Prasad never disputed what the study found. They point out the methodology is unreliable and there's no sure way to tell whether masking worked, despite what the NEJM might say.

You also must have missed where the school districts in North Dakota showed no difference in case rates between masked and unmasked districts (same as for entire state of South Carolina, same as for Georgia's Chatham and Effingham Counties, same as for my two kids' schools...something you obviously will continue to refuse to address because it's inconvenient to your narrative). You also must have missed where they took an incomplete study, extended it out to nine weeks instead of two and included 3x more counties, and found no difference in case rates.

I will concede, as the author does, that fewer cases of Covid occurred in the masked school districts in Massachusetts. So conversely, will you not concede other studies and data show no difference?