Figure 4. Hospital Variation in Advanced Imaging by All Patient-Refined Diagnosis Related Groups, 2009-2018.

Distribution of the proportion of emergency department encounters with imaging. For each box, the horizontal line represents the median proportion, and the upper and lower edges of the box represent the upper and lower quartiles. The whiskers indicate the range, excluding outliers. Outliers (circles) are values greater than 1.5 times the interquartile range above the median. Concussion includes concussion, closed skull fracture, uncomplicated intracranial injury, coma of less than 1 hour, or no coma. Migraine includes migraine and other headaches. ENT indicates ear, nose, and throat; MRI, magnetic resonance imaging.