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Prior work has shown Medicaid and self‐pay insurance status is associated with emergency department (ED), rather than outpatient clinic, presentation for uncomplicated acute rhinosinusitis (ARS). We investigate whether the disparate use of ED resources for this nonemergent condition by patients with Medicaid and self‐pay insurance can be attributed to presentation overnight or on weekends.

Cross‐sectional survey of 990,849 patients from the 2009 and 2010 National Hospital Ambulatory Medical Care Survey presenting to EDs with uncomplicated ARS. Patients with orbital and intracranial complications of ARS were excluded.

Univariate and multivariate associations identified demographic and socioeconomic characteristics, including insurance status, which were independently associated with overnight (between 5 pm and 7 am) or daytime weekend ED …