The Center for Research on Educational Outcomes (CREDO) at Stanford University has just released a report showing how the nation’s online charter schools perform. The results are not good, specifically in Ohio.

The study found that the average Ohio student in an eSchool loses 144 days of learning in reading and about 180 days in math — about an entire year — compared with how those students would have performed in a local public school. Only three states’ eSchool sectors do worse in reading and 5 do worse in Math.

The study did not mention specific online schools by name. However, the nation’s largest for-profit K-12 school — Ohio’s Electronic Classroom of Tomorrow — received all Fs and a single D on its latest state report card. And the state’s eSchool sector has been historically the worst performing of the state’s already nationally ridiculed charter sector.

Interestingly, the report recommended that states take their time to understand how online schools are doing before allowing for more expansion. A few years ago, Ohio lifted its long-time freeze on new eSchools so more and more can come to the state. It never did the evaluation CREDO now recommends.