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. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: J Am Coll Surg. 2010 Sep 15;211(5):601–608. doi: 10.1016/j.jamcollsurg.2010.07.006

Table 2.

Number of Hospitals or Providers and Missed Quality Measures per Quartile of Patient Volume

n No. of hospitals or providers Median volume (IQR) Mean no. of missed quality measures (SD)
Hospital annual volume
      1st quartile 3560 174 13 (8, 19) 1.71 (0.75)
      2nd quartile 3550 49 39 (35, 44) 1.63 (0.79)
      3rd quartile 3590 29 63 (58, 71) 1.44 (0.78)
      4th quartile 3470 14 110 (105, 148) 1.57 (0.91)
Physician annual volume
      1st quartile 3532 913 4 (3, 5) 1.68 (0.78)
      2nd quartile 3537 404 8 (7, 9) 1.58 (0.77)
      3rd quartile 3592 212 15 (13, 17) 1.49 (0.81)
      4th quartile 3509 100 29 (24, 41) 1.61 (0.89)