Study: All day preschool benefits African Americans more

{The study found that among African American students and boys in general, those who attended full-day pre-kindergarten classes outperformed their Head Start peers who had only half-day programs on reading benchmarks. But the results also applied more broadly.]

I think that's fabulous, but the study doesn't say what factor about being in all day preschool makes the kids do better and is this study the same for any child regardless of ethnicity would benefit from all day preschool.

My son goes to a half day program, but I do alot with him at home and in the community. Hopefully the
study will be more specific as to why the kids do better in their next study.