A 2003 study published in the New England Journal of Medicine found that a random sample of about 7,500 adults received only about half of the recommended treatments appropriate to their medical conditions. “These deficits, which pose serious threats to the health and well-being of the U.S. public, persist despite initiatives by both the federal government and private health care delivery systems to improve care,” the authors wrote. The study was based on a random sample of adults living in 12 metropolitan areas who were interviewed, and who also gave written consent to have their medical records copied for a two-year period.
Source: Elizabeth McGlynn, et al. “The Quality of Health Care Delivered to Adults in the United States,” New England Journal of Medicine, 2003