A number of hospitals in the Chicago area earned an "A" grade ranking in the latest safety report from health care watchdog group Leapfrog, with others dipping in their rankings and at least five Illinois hospitals receiving an "F" grade.

The biannual Safety Grade report, released Thursday, assigns grades to all general hospitals in the U.S. "based on their ability to protect patients from medical errors, accidents, injuries and infections," the organization wrote in a release announcing the report.

The group then assigns letter grades to hospitals on a scale of "A," "B," "C," D" and "F," using up to 30 performances measures.

Overall, nearly 3,000 general acute-care hospitals were evaluated based on their abilities to prevent medical errors, accidents and infections, editors said.

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