The March/April 2010 edition of the AMA Guides Newsletter reports that a review of over 6,000 cases, mostly from California, resulted in 80% of them questioned by expert rating reviewers. For the very small number of Nevada cases reviewed for this study , the error rate was much less, with an average difference of 3% whole person impairment. This study confirms what most attorneys who represent injured workers know about rating evaluations. There is a tremendous difference in ratings by the various rating doctors authorized to perform ratings in Nevada, even though the rating doctors should theoretically reach the same numbers by following the methods in the Guides.

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