This is damning. By removing prov mask mandates last yr, Alberta set up an internal experiment between schools boards. The province's own analyses found:

"School boards without mask mandates have 3 times more outbreaks in their schools, on average."
(Feb. 7/22) #ABEd Case rates and hospitalization rates were also lower in areas with mask mandates.

All this time, they sat on AB-specific data re: masking & schools, directly linked to local communities. But politics prevailed & 'leaders' ignored evidence from the same experiment they created.

These statements by @CMOH_Alberta confound the variables at hand. Moving school online cannot be ruled out as having minimal/zero impact on reducing case #'s. This is a classic empirical study no-no, and choosing one factor over another is pure bias.

cbc.ca/news/canada/ed… Several restrictions were rolled out at the same time. It is hard to tease out which variables contributed to outcome, incl. possible interactions betw. variables. She only chooses to emphasize the limit on sports & other school activities--- based on what data, what analyses??