tl;dr 3133 (control + treatment) tennessee lower-income children were checked after their pre-k year and third grade year. (Treatment children were able to atte

tl;dr 3133 (control + treatment) tennessee lower-income children were checked after their pre-k year and third grade year. (Treatment children were able to attend the TN pre-k program.) After third grade, the treatment children scored .012 standard deviations lower than the control group for math, .009 worse in science, but similarly for reading and misbehavior. The treatment group also had a higher rate of special education enrollment than control: 13% vs 10.6%.