The report also found that only 2.5% of all characters last year in the 100 top-grossing films had a disability.
Although the #OscarsSoWhite campaign has sparked mainstream debate for several years, the new USC report suggested that Hollywood producers have not shifted in response.
“There is a cacophony of voices crying out for change, but Hollywood hasn’t changed its hiring practices,” Stacy L Smith, author of the report, said in an interview.
The report also suggested that states with tax incentive programs for filming could consider tying funding to employing diverse casts and crew members.