Shorter hours for interns and resident physicians, instituted by the Accreditation Council for Graduate Medical Education in 2011, have had no significant effect on patient outcomes, according to an analysis of more than 6 million patient records by researchers at the University of Pennsylvania's Perelman School of Medicine and the Children's Hospital of Philadelphia.

The study, published in JAMA, examined nearly 6.4 million Medicare patient hospital admissions between July 2009 and June 2012. The patients were admitted for heart attack, stroke, gastrointestinal bleeding or congestive heart failure, or for general, orthopedic, or vascular surgery.

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