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Table 2 Survey practices and sample physicians

From: In-office magnetic resonance imaging (MRI) equipment ownership and MRI volume among medicare patients in orthopedic practices

B: Number of physicians and practices among treatment and control group
  Number of practices Number of physicians
  Comparison Treatment Total Comparison Treatment Total
2007 11 11 22 67 100 167
2008 4 4 8 17 35 52
2009 8 8 16 97 117 214
Total 23 23 46 181 252 433
  1. Sources: AAOS Survey Data, 2012; CMS NPPES Downloadable File [39]; see text