645 43.1 36.9 20.0 3.10 2.82 2.82 7.61 13.52 70.14 3.66 96.34 10.99 17.18 71.83 3.38 11.27 18.87 15.77 3.38 10.42 11.27 12.96 12.68 92.68 7.32 8.61 0.06 153 131 71 11 10 10 27 48 249 13 342 39 61 255 12 40 67 56 12 37 40 46 45 329 26 355 355 % (mean where indicated) 2788 98 2886 2886 129 326 498 441 298 222 481 168 323 535 652 1699 823 2063 152 443 289 562 568 872 2082 579 225 Count 96.60 3.40 3.07 0.03 4.47 11.30 17.26 15.28 10.33 7.69 16.67 5.82 11.19 18.54 22.59 58.87 28.52 71.48 5.27 15.35 10.01 19.47 19.68 30.21 72.14 20.06 7.80 % (mean where indicated) Non-TAR Hospitals (n = 2886) Source: KNG Health Consulting Analysis of 2011 and 2012 100% Medicare Inpatient Standard Analytic File. Abbreviation: TAR, total ankle replacement. a P value is associated with Pearson F2 test for categorical variables and t test for continuous variables. **P<.01, ***P<.001. Teaching hospitals (%) Nonteaching Minor teaching Major teaching Bed size, no. of beds (%) 0-24 25-49 50-74 75-124 125-199 t200 Location (%) Rural Urban Ownership (%) Government For profit Nonprofit Region (%) New England Mid-Atlantic South Atlantic East North Central East South Central West North Central West South Central Mountain Pacific Orthopedic specialty (%) Nonorthopedic specialty hospital Orthopedic specialty hospital No. of orthopedic cases per 100 (mean) Overall margins (mean) Count TAR Hospitals (n = 355) 2011 .000*** .000*** .000*** .000*** .000*** .000*** .000*** .000*** P Valuea 359 27 386 386 14 30 72 80 18 35 47 44 46 51 66 269 22 364 13 14 15 33 55 256 175 141 70 Count 93.01 6.99 8.21 0.06 3.63 7.77 18.65 20.73 4.66 9.07 12.18 11.40 11.92 13.21 17.10 69.69 5.70 94.30 3.37 3.63 3.89 8.55 14.25 66.32 45.34 36.53 18.13 % (mean where indicated) TAR Hospitals (n = 386) Table 2. Summary Statistics on Hospital Characteristics for TAR and non-TAR Hospitals (Medicare Fee for Service). 2751 107 2858 2858 127 337 492 417 292 224 477 170 322 523 650 1685 814 2044 153 439 284 556 561 865 2063 569 226 Count 96.26 3.74 3.05 0.03 4.44 11.79 17.21 14.59 10.22 7.84 16.69 5.95 11.27 18.30 22.74 58.96 28.48 71.52 5.35 15.36 9.94 19.45 19.63 30.27 72.18 19.91 7.91 % (mean where indicated) Non-TAR Hospitals (n = 2858) 2012 .000*** .000*** .003** .000*** .000*** .000*** .000*** .000*** P Valuea