There are two reasons for this:
First, each of the financial and operational line items presented in the analysis are treated as independent variables. For example, the range of observed case mix values for orthopedics is independent of the observed case mix values for gastroenterology.
Furthermore, each line item in our analysis excludes centers that did not report the respective information. Therefore, the median case mix represents the median percentage of total cases performed within the designated specialty for all centers performing cases in the subject specialty. Stated differently, it is the median percentage of total cases for all centers which perform the designated specialty. Individual centers included in the sample do not perform cases in all of the specialties listed; therefore, the sum of the individual specialties will not equal 100%.
This is true for all of the variables included in the study including operating expenses, payor mix, staff hours per case, etc. The range of observations for the totals is independent of the individual variables which comprise the total. Therefore, the totals will not equal the sum of the individual components.
The data presented in the study is collected for the 2016 and 2017 time periods.
Currently VMG does not have enough participation to publish a benchmarking study for single specialty or orthopedic focused ASCs. However, VMG is in the process of gathering additional information from the centers to publish more specific benchmarking analysis.
Currently VMG does not receive information on OR turnover time, however we have added this to our information request. VMG will add this to the survey results once we have collected enough information.
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