Campbell, F. A. & Ramey, C. T.
1995

This article presents results of cognitive and achievement testing at age 15 as well as data concerning grade retention and assignments to special education. 

Citation

Campbell, F. A., & Ramey, C. T. (1995). Cognitive and school outcomes for high-risk African-American students at middle adolescence: Positive effects of early intervention. American Educational Research Journal, 32, 743-772.