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Public Health Emergency Preparedness

This resource was part of AHRQ's Public Health Emergency Preparedness (PHEP) program, which was discontinued on June 30, 2011, in a realignment of Federal efforts.

This information is for reference purposes only. It was current when produced and may now be outdated. Archive material is no longer maintained, and some links may not work. Persons with disabilities having difficulty accessing this information should contact us at: Let us know the nature of the problem, the Web address of what you want, and your contact information.

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3. Scenario Outputs

When you run the model, the output is displayed on the Scenario Results page (go to Exhibit 2).

Exhibit 2: Scenario Results Page

Exhibit 2. Scenario Results Page.  A screen shot of a scenario results page provides information on the total hours to evacuate as well as the total hours to evacuate by patient type and the number of round trips per vehicle by vehicle type.

Displayed on the Scenario Results page is:

  • The total evacuation time. The evacuation time is defined as the elapsed time from when the first patients begin loading on vehicles at evacuating facilities to when the last patient has been loaded on a vehicle at an evacuating facility. Total evacuation time does not include:
    • The time from when the evacuation decision is made to when the evacuation actually begins and patients start to be moved.
    • The travel time from vehicle staging areas to an evacuation facility at the beginning of the evacuation process.
    • The travel time for the last evacuated patient from an evacuating to receiving facility.
  • The total evacuation time by vehicle type—that is, the time required to evacuate all the patients evacuated on ALS ambulances, the time required to evacuate all the patients evacuated on BLS ambulances, etc.
    • For both the New York City and Los Angeles pilot tests, the total evacuation time was equal to the evacuation times for patients requiring ALS transport. That is, the availability of ALS was the key constraint that determined the total evacuation time.
  • The number of round trips per vehicle per vehicle type made during the evacuation.
    • As noted earlier, the model was built under the assumption that multiple round trips would be required for each vehicle participating in the evacuation. If your output indicates that only a single round trip is required, you should reduce the number of available vehicles specified on the Scenario Input page; otherwise, the model allocates patients to vehicles inefficiently and the output of the model may be nonsensical. This is generally only an issue with buses and wheelchair vans, not ambulances.

On the Scenario Results page you can:

  • Print the results. Use your browser print button to print the output. You can print the associated inputs by printing the Scenario Input screen using your browser's print button.
  • Modify the inputs and re-run the model. Click the Modify Scenario button to return to the Scenario Inputs page, where you can modify one or more data elements and re-run the model.

Tip: So that you have a clear understanding of how changes in inputs affect the output, you should only change one data element at a time.

  • Save the inputs. Click the Save Scenario button to save the inputs.

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