The Dartmouth Atlas Project uses Medicare data to provide comprehensive information and analysis about national, regional, and local markets, as well as individual hospitals and their affiliated physicians. The Dartmouth Atlas Project have helped policymakers, the media, health care analysts and others improve their understanding of the efficiency and effectiveness of US health care system. The data for research purposes come from the Centers for Medicare and Medicaid Services (CMS), U.S. Census, the American Hospital Association, the American Medical Association, and the National Center for Health Statistics.
A rate is the number of events or amount of resources divided by the number of the population. Rates based on a count of fewer than 11 patients are not displayed for reasons of patient confidentiality. Rates with fewer than 26 expected events are reported in parentheses to indicate lack of statistical precision; for these rates, the margin of error is greater than 20%, so the estimate is considered statistically unreliable.