The only parameter in which a significant difference was seen was that attending surgeons completed the procedure significantly faster by 9 minutes—39.9 vs. 48.6 minutes, but this may have been influenced by the fact that attending surgeons used laparoscopic staplers 13.5% of the time as opposed to use by the residents in only 2% of cases, also a significant difference.
This before-and-after study of more than 1600 appendectomy patients was published in JAMA Surgery. Between 2008 and 2012, residents were permitted to perform appendectomies without direct supervision by an attending surgeon. The pre-2012 group included 548 operations performed by general surgery residents alone. Because of a policy change, all of the appendectomies from 2012 to 2015 were performed by attending surgeons alone or directly supervising a resident.