Fig. 3.

A heatmap showing the relation between graduation year and total performance score. This is for the specialties consisting of “Internal Medicine,” “Family Practice,” “Nurse Practitioner,” and “Certified Registered Nurse Anesthetist.” Practitioners across all hospitals were used. In subplot (a), N = 191,774 refers to the total number of relationships between internal medicine practitioners and hospitals. Similarly, “Med. Yr” represents the median graduation year for all internal medicine practitioners across all hospitals, which is 1993. The colors in the map represent the counts at specific (x,y) locations corresponding to combinations of (Graduation year, total performance score)