From the article: >The researchers compared outcomes for patients within the same hospitals who were cared for by doctors with different exam scores. This allo

From the article: >The researchers compared outcomes for patients within the same hospitals who were cared for by doctors with different exam scores. This allowed the researchers to eliminate, or at least minimize, the effect of differences in patient populations, hospital resources, and other variations that might influence the odds of patient death or readmission, independent of a doctor’s performance.