1 Department of Emergency Medicine, CEP-America/Presence Mercy Medical Center, Aurora, Illinois.
2 Department of Emergency Medicine, Wake Forest Baptist Medical Center, Winston Salem, North Carolina.
3 Emergency Care Coordination Center, Office of the Assistant Secretary for Preparedness & Response, US Department of Health and Human Services, Washington, DC.
4 Office of the Assistant Secretary for Preparedness & Response, US Department of Health and Human Services, Washington, DC.
This study describes the interval between receipt of a 911 call and the arrival of the first emergency medical service unit on the scene of a reported emergency in the United States.