The Indiana attorney general's office is appealing a judge's ruling that the state owes thousands of current and former employees a total of $42.4 million for 20 years of back pay.

A notice of appeal was filed Friday.

Judge John Hanley issued the ruling Tuesday in Marion Superior Court in Indianapolis.

The judgment was based on estimates that up to 15,000 state employees worked 40-hour weeks from 1973 to 1993 but received the same pay as others in similar jobs who worked only 37.5 hours.

The state announced a settlement in the 16-year-old class-action lawsuit last year. But the state pulled out after compensation claims by former workers surpassed the settlement's $8.5 million limit.

A trial was held in March.