These findings provide evidence for the validity of Step 2 CK scores. Given the magnitude of its relationship with patient outcomes, the results support the use of the examination as an effective screening strategy for licensure.

One-quarter of practicing physicians in the United States are graduates of international medical schools. The quality of care provided by doctors educated abroad has been the subject of ongoing concern. Our analysis of 244,153 hospitalizations in Pennsylvania found that patients of doctors who graduated from international medical schools and were not U.S. citizens at the time they entered medical school had significantly lower mortality rates than patients cared for by doctors who graduated from U.S. medical schools or who were U.S. citizens and received their degrees abroad. The patient population consisted of those with congestive heart failure or acute myocardial infarction. We found no significant mortality difference when comparing all international medical graduates with all U.S. medical school graduates.

The total number and distribution of medical schools around the world are not well matched with existing physician numbers and distribution. The collection and aggregation of medical school data are complex and would benefit from better information on local recognition processes. Longitudinal comparisons are difficult and subject to several sources of error. The consistency and quality of medical school data need to be improved to accurately document potential supply; one example of such an advancement is the World Directory of Medical Schools.