The study evaluated 141 medical schools on the basis of their “social mission”: a set of criteria that rated how many students graduating in 1999-2001 followed the primary care track; how many of these graduates ultimately worked in rural or underserved communities; and how many were Native American, Hispanic or African-American. The paper defined general medicine, internal medicine, and pediatrics as primary care, and looked at the classes from 10 years ago because they have completed all their residency and national service requirements by now.