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Research Letter
July 24, 2019

Validation of Zip Code–Based Estimates of Ambulance Driving Distance to Control for Access to Care in Emergency Surgery Research

Author Affiliations
  • 1Center for Surgery and Public Health, Department of Surgery, Brigham and Women’s Hospital, Boston, Massachusetts
  • 2Redivis Inc, Mountain View, California
  • 3Deputy Editor, JAMA Surgery
JAMA Surg. 2019;154(10):970-971. doi:10.1001/jamasurg.2019.2179

Proximity to hospital facilities and duration of the prehospital interval are crucial measures when studying injury outcomes,1 but most large administrative data sets lack information on prehospital time or distance from the site of an injury event to the treating hospital.2,3 We sought to validate zip code–based estimates of ambulance driving distance to support future use of administrative data sets in the study of emergency medical services, trauma systems, and injury outcomes.

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