The coefficient of primary interest is P3, the estimate for the difference between the change among the patients living in AF4C) communities and the change in the outcome of interest among the patients living in the rest of the country (i.e., the difference in difference estimate).
We compared scores for AF4C) communities and the national sample during Round 1 and Round 2.
With AF4C's program, chess instructors teach a year-long curriculum and train K-6 teachers to include it themselves in subjects such as math and history.