The Thomas B. Fordham Institute found 46 percent of 183,000 public and charter school students in Cincinnati, Cleveland, Columbus and Dayton are attending schools graded either D or F (officially, academic watch or academic emergency). That compares to about 75,000 students in D or F schools in the entire rest of the state.
See the full press release here.
Analysis of District and Charter School Performance in the Ohio 8
The Thomas B. Fordham Institute also commissioned Public Impact to conduct a brief analysis of charter school performance in 2006-2007. See their findings here.