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Table 3 Sample means for physician practice sample, by on-site MRI status

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

  All MRI No MRI
  [n = 433] [n = 252] [n = 181]
MRI Volume a (% Medicare Visits)    
 Pre-MRI year 1.151 1.460 0.595
 Post-MRI year 1.312 1.530 0.919
 ∆(Post-Pre) 0.161 0.071 0.324
Ortho-MRI Volume b (% Medicare Visits)    
 Pre-MRI year 1.066 1.391 0.482
 Post-MRI year 1.239 1.478 0.809
 ∆(Post-Pre) 0.173 0.087 0.327
MRI Year (%)    
 2006 38.55 44.72 27.43
 2007 26.54 31.21 18.14
 2008 34.91 24.08 54.42
Number of providers (%)    
 1-2 2.37 1.47 3.98
 3-5 6.64 5.90 7.96
 6-10 26.86 12.53 52.65
 >10 64.14 80.10 35.40
Practice Payer Mix (%)    
 Medicare 27.07 26.13 28.77
 Private Insurance 46.90 47.83 45.22
 Workers’ Comp 12.30 12.10 12.64
 Other 13.74 13.94 13.38
Area Characteristics (Post-Pre)    
 ∆Per capita income ($1000s) 1.211 1.916 −0.058
 ∆Pop age 65+ (%) 0.449 0.467 0.417
 ∆Unemployment (%) 2.860 2.461 3.578
 ∆MDs/1000 Population −0.0018 −0.0045 0.0032
  1. Sources: Medicare Claims Data; AAOS Survey Data, 2012; Area Resource File (see text)
  2. aHCPCS codes 71552, 73218, 73718, 74183, 77059, 70543, 70551, 70553, 72141, 72146, 72148, 72156, 72157, 72158, 72195, 72197, 73220, 73221, 73222, 73223, 73720, 73721, 73722, 73723, 70336, 70540, 70542, 70552, 71550, 71551, 72142, 72147, 72149, 72196, 73219, 73719, 74181, 74182, or 77084
  3. bHCPCS codes 72141, 72146, 72148, 72156, 72157, 72158, 72195, 72197, 73220, 73221, 73222, 73223, 73720, 73721, 73722, or 73723