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. Author manuscript; available in PMC: 2018 Jun 20.
Published in final edited form as: J Am Coll Cardiol. 2017 Jun 20;69(24):2913–2924. doi: 10.1016/j.jacc.2017.04.032

Figure 3. Median annual operator volumes by hospital referral region.

Figure 3

Annual operator volumes varied by Dartmouth Health Atlas hospital referral region. In general, regions in the western and southwestern U.S. had the lowest median operator volumes (depicted in lighter purple); northeastern and midwestern regions had higher median operator volumes.