The decision to move the date to the end of February from The end of January in Alberta was due to a lack of kids one year or a surplus in the following year. So no thought from when a kid is ready for school was taken.
I also think the 1% world of CP naturally selects itself to higher achievers who wouldn't have had issues under either option. It's why the Phd study linked above is flawed as it only looks at the elite who would have succeeded anyways. A better study would be high school graduation rate and university graduation rate.
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