First of all, thanks for the thorough response, I appreciate it.

And that I agree with you about the others you listed; what happened with the war on phonics is like criminal levels of negligence and willful ignorance. (Anyone reading this, start with the Sold a Story podcast).

I’ll have to take the results at face value since I know almost nothing about the alternatives they’re comparing to.

I am also willing to believe that of all the methods tried, DI works better than constructivism approaches for < grade 5, even if that may not be true for older students.