Though not exactly as you described, something similar was done and published in 2016 (largely leading to this change, since there was not an increase in mortality risk)
One of the main challenges of course in this area is looking at patient outcomes with an incredible amount of potentially confounding variables, since "resident work hours" is just one of the many things that influence patient outcomes at a hospital.
http://www.nejm.org/doi/full/10.1056/NEJMoa1515724
One of the main challenges of course in this area is looking at patient outcomes with an incredible amount of potentially confounding variables, since "resident work hours" is just one of the many things that influence patient outcomes at a hospital.