COLUMBUS: Columbus City Schools played “fast and loose” with attendance data, grades and other records, the Ohio auditor said Tuesday in releasing findings from an 18-month investigation.

Auditor Dave Yost said his review of attendance data scrubbing at the state’s largest school district showed a culture of changing the numbers and a lack of oversight by its board of education.

District employees have been accused of altering attendance records for struggling students to improve performance ratings, which can be used to determine government funding and employee bonuses.

The auditor’s review covered the 2010-11 school year, and Yost said the district has since made some changes in its protocol.

Shortly after the report’s release, Columbus Superintendent Dan Good said at a separate news conference that the district was moving to fire four principals who he says were associated with the data tampering. They are being placed on unpaid leave and recommended for termination.

Another 11 employees implicated in the data-changing scheme have already left the schools on their own or in agreement with the district, Good said. Others could still face discipline.

Good told reporters that the district has and will continue to address reporting issues that the auditor has identified.

“I offer no excuses on behalf of the district,” he said, adding that he wouldn’t let “anything of this nature” happen again.

The record-keeping at the schools went beyond a paperwork problem, Yost said at a news conference.

Investigators reviewed a sample of 200 letter grade changes in the district and found that 83.5 percent did not have documentation to support the grade shift.