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Why are signals and counts different if I switch between searching by county and by hospital for my geographic area in the emergency department data?

April 26, 2017area counts County different emergency geographic hospital searching signals Switch

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Why are signals and counts different if I switch between searching by county and by hospital for my geographic area in the emergency department data?

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There are several reasons. Searching by hospital includes all patients who visited that hospital, regardless of where they live. Searching by county is based on a patient’s county of residence. Patients may visit a hospital that is not in their county of residence. Similarly, out of state patients may visit a hospital that you have access to; they will be included in results searched on by hospital but will not be included in results searched on by county. Searching by county(ies) or PHRST region(s) also excludes records with NULL (missing) counties, but these visits will be included in searches by hospital.