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COLUMBUS, Ohio -- A report from Ohio's auditor finds that Columbus city schools played "fast and loose" with attendance data, grade changes and other records and documentation.

Auditor Dave Yost on Tuesday says an investigation into attendance data scrubbing in the state's largest school district showed a "culture" of changing the numbers.

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.

Yost said a review of a sample of 200 letter grade changes found that 83.5 percent of the data tested did not have documentation to support the grade changes.

The 18-month investigation covered the 2010-11 school year. Yost says the district has since made changes.