Insurance claims against doctors, nurses and other medical professionals have stabilized for the first time in years, according to a new survey.

The seventh annual Aon Hospital Professional Liability and Physician Liability Benchmark Analysis, which measured 47,735 U.S. claims representing more than $4.4 billion of incurred losses from 1997 through 2005, found that the overall frequency of medical malpractice claims has not increased for two years running, but the average size is still rising.

More than 700 health care facilities provided loss and exposure data for the study, ranging from small community hospitals to multistate health care systems.

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