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Table 1 Distribution of Pairs (Study Group and Comparison Group Matches)

From: Economic value of orthotic and prosthetic services among medicare beneficiaries: a claims-based retrospective cohort study, 2011–2014

  Lower extremity orthotic analysis Spinal orthotic analysis Lower extremity prosthetic analysis
Study group Comparison group Study group Comparison group Study group Comparison group
Number of patients with O&P service and etiological diagnosis included in custom cohort 239,655 255,156 224,994 240,609 13,823 5959
Number of pairs after propensity score match 43,487 43,487 34,573 34,573 545 545
Percent of patients represented in the effective sample 18.1% 17.0% 15.4% 14.4% 3.9% 9.1%
  1. Source: Dobson | DaVanzo analysis of custom cohort Standard Analytic Files (2011–2014) for Medicare beneficiaries who received O&P services from January 1, 2012 through June 30, 2013 (and matched comparisons), according to custom cohort database definition