Why do the national average population and rates given in the state and regional tables not match the numbers given in the hospital tables?
In the state and regional studies, the study population was a 20% sample of resident enrollees with one or more of the nine chronic illnesses, regardless of whether they were hospitalized during the last two years of life. In the hospital-specific studies, only decedents who had one or more medical hospitalizations for one of the nine chronic illnesses were included. Medicare enrollees who were hospitalized with one or more of the nine chronic illnesses were assigned to the hospital most frequently used during the last two years of life. A 100% sample of deaths was used for the inpatient utilization rates; a 20% sample was used for Part B rates.
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