The research used methods commonly associated with meta-analysis, an approach for integrating research findings across studies. Following a literature search and compilation of a bibliography, study variables were coded, and each study was rated on a series of variables related to internal and external validity. This information was considered in calculating the average prevalence rate across studies. The analysis focused mainly on the prevalence of juveniles with learning disabilities or mental retardation. Findings indicated that 35.6 percent of the juveniles held in juvenile detention, correctional, and shelter facilities in February 1985 would be considered learning disabled, and 12.6 percent would be considered mentally retarded. This information should be used as the first step in developing responsible public policy and effective programs. Tables, notes, and 47 references.