The Pennsylvania School Boards Association conducted a study of costs, comparing charter schools and public schools, and concluded that the charter schools have higher salaries for those at the top and spend twice as much on administration as public schools.

Furthermore, the bulk of their revenue–as much as 84%–is taken away from public schools, leaving them in worse condition.

Charter-school administrative expenditures are nearly double those of conventional public schools, and their highest-ranking officials are paid far more.

They spend less on instruction than school districts, but more on support services and facilities.

And while charter-school enrollment has jumped significantly over time, payments to the schools are far outpacing their actual rates of growth in admission.

All that is according to a report on Pennsylvania’s charter schools issued Thursday by the Pennsylvania School Boards Association, made up of nearly 4,500 school board members.

In a 35-page study that came after rounds of records requests during the last 15 months, the conclusions present a broad picture of Pennsylvania’s 173 charter schools, which have become part of an ongoing national debate about what effect the charter-school movement is having on traditional public schools.

“This is not intended to be any sort of an attack on charter schools,” said Andrew Christ, education policy analyst for the organization, during a conference call Thursday.

But, he said, “charter schools need to be held to the same standards of accountability and transparency as traditional public schools.”