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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: J Am Coll Radiol. 2015 Sep 26;12(12 0 0):1427–1433. doi: 10.1016/j.jacr.2015.06.037

Table 3.

Hospital characteristics by year

1993 2003 2012
Hospital type, percentage (95% CI)
  Large 65.2 (54.3 – 76.0) 78.1 (71.1 – 85.1) 73.9 (70.7 – 77.1)
  Urban 98.9 (98.6 – 99.1) 98.4 (97.4 – 99.5) 98.6 (98.2 – 98.9)
  Teaching 60.7 (50.7 – 70.8) 76.3 (70.4 – 82.3) 78.7 (76.5 – 81.0)
  High case volume (>12/year) 46.7 (39.2 – 54.3) 57.6 (50.7 – 64.5) 55.3 (48.2 – 62.4)*
*

Data from 2011 used due to change in NIS sampling design rendering 2012 hospital-level volume data not comparable to previous years.