A new report about the performance of schools authorized by the State Charter Schools Commission finds a mixed bag, with 15 statewide charter schools neither excelling far ahead of nor dragging far behind the traditional public schools against which they’re meant to compete.

At the elementary school level, most of the charter schools performed as well as the average traditional school in 2014-15, says the report by Georgia State University, which provides significant detail about the performance of each school. In general, by middle school, the charters were performing as well as or better than average. High school was a mixed bag.

The Charter Schools Commission was established in 2012 by a state constitutional amendment and began working in 2013. It authorizes a subset of charter schools, with local school districts still the lead authorizer for most (the local districts work with the Georgia Department of Education, a separate entity from the Commission).

As of December, 91,000 Georgia students were attending 441 charter schools, including 97 "start-up" charter schools, 18 "conversion" charter schools, and 326 "charter system" schools in 32 charter systems, which are regular school districts that have signed charters with the state, according to a recent Education Department report. The number of charter systems is growing, though.