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2.1. Study design and setting

GM Glenn Melnick
JO June F. O'Leary
BZ Ben A. Zaniello
LA Luis Abrishamian
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The data for this analysis were supplied by Collective Medical, a care coordination software company that links to hospital operations and electronic medical records systems. We drew upon daily hospital registration data to measure ED visits from more than 1000 hospitals. The data cover between 40% to 100% of hospitals in nine states (California, Washington, Oregon, Virginia, Massachusetts, Arkansas, West Virginia, Idaho, New Mexico) for the period January 1, 2019 through March 31, 2022. The study sample includes only hospitals reporting for all months during this 39-month period.

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