• Luke E Kayser, Devin E Spolsdoff, J Priyanka Vakkalanka, Talon J Hoefer, Curtis A Walker, and Peter K Georgakakos.
• Johnson County Ambulance Service, Iowa City, Iowa.
• Prehosp Emerg Care. 2024 Jun 24: 151-5.

ObjectivesThis study sought to evaluate performance indicators to assist a static-based 9-1-1 agency in defining its response efficiency.MethodsInitial assessment of three metrics-unit hour utilization (UHU), fractile response intervals, and level 0 frequency (occurrence when no ambulances are available to respond)-suggested the agency's response over its four coverage zones was inefficient, so an operational change was implemented: an ambulance was relocated from one service area to another to improve the overall response productivity. A 2-year retrospective analysis was performed to determine the impact ambulance relocation had on the three targeted measurements.ResultsThe operational change resulted in a statistically significant change in unit hour utilization, a non-significant increase in fractile response intervals, and a statistically significant reduction in level 0 frequency from pre- to post-operational change times.ConclusionsThese findings suggest a way to evaluate the efficiency of static-based ambulance deployment and potentially identify strategies for redeployment.

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