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ContextReferral to high-volume hospitals has been recommended for operations with a demonstrated volume-outcome relationship. The characteristics of patients who receive care at low-volume hospitals may be different from those of patients who receive care at high-volume hospitals. These differences may limit their ability to access or receive care at a high-volume hospital.ObjectiveTo identify patient characteristics associated with the use of high-volume hospitals, using California's Office of Statewide Health Planning and Development patient discharge database.Design, Setting, and ParticipantsRetrospective study of Californians receiving the following inpatient operations from 2000 through 2004: elective abdominal aortic aneurysm repair, coronary artery bypass grafting, carotid endarterectomy, esophageal cancer resection, hip fracture repair, lung cancer resection, cardiac valve replacement, coronary …