Post-Acute Care Episodes Expanded Analytic File. 2.2 Analytic Samples

04/01/2011

One of the main goals of this project was to increase the sample size of the analytic file from the 5 percent Medicare beneficiary sample used in earlier work. The file constructed for this project includes 30 percent of beneficiaries with acute hospital-initiated episodes, 30 percent of beneficiaries with HHA-initiated episodes, plus 100 percent of beneficiaries initiating episodes in LTCH and IRF settings in 2006, 2007, and 2008. Two analytic samples were incorporated into the data files as described below (Figure 1).

Figure 1. Analytic Samples: Longitudinal Cohort and Cross Section

Figure 1.    

Figure 1 is a schematic of the two analytic samples. Analytic Sample 1 is the longitudinal cohort which includes beneficiaries with initiating events in 2006 and two years of their claims. Analytic Sample 2 is the cross section. This includes the first episode per year for beneficiaries with initiating events in 2006, 2007, and 2008.

  • Analytic Sample 1: Longitudinal Cohort—The longitudinal cohort sample consists of a 30 percent sample of beneficiaries with an initiating event in an acute hospital or in home health in 2006 plus 100 percent of beneficiaries with an initiating event in LTCH or IRF in 2006. To construct the cohort sample, RTI selected the first initiating event in 2006 per beneficiary and then constructed a file of all claims following the initiating event for 2006, 2007, and 2008 for these beneficiaries. This file contains two calendar years of data for each beneficiary in the cohort.
  • Analytic Sample 2: Cross Section—The cross-sectional samples consist of a 30 percent sample of beneficiaries with an initiating event in an acute hospital or in home health plus 100 percent of beneficiaries with an initiating event in LTCH or IRF in 2006, 2007, and 2008. RTI constructed the first episode per year for these beneficiaries to compare changes in utilization patterns over the 3-year study period.

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