Too many people die needlessly at U.S. hospitals, according to a sweeping new Medicare analysis showing wide variation in death rates between the best hospitals and the worst.

The analysis examined death rates for heart attacks, heart failure and pneumonia at more than 4,600 hospitals across the USA. At 5.9% of hospitals, patients with pneumonia died at rates significantly higher than the national average. With heart failure, 3.4% of hospitals had death rates higher than the average, and 1.2% of hospitals were higher when it came to heart attack.

Researchers also found that the majority of U.S. hospitals operate the equivalent of revolving doors for their patients. One of every four heart failure patients and slightly less than one in five heart attack and pneumonia patients land back in the hospital within 30 days, data show.

Read this full story here on the USA Today website.