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This study uses a survival analysis of Medicare patients’ ambulatory visit patterns starting in 2011 for up to 24 months. Patients were followed for 24 months or until death or occurrence of the composite endpoint of an ED episode—that is, an ED visit followed by discharge, an observation stay, or a hospital admission through the ED. Since secondary, de-identified data were used, this study was exempt from IRB approval in accordance with Federal common rule (section 45 CFR 46.101[b][5]).
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