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. Author manuscript; available in PMC: 2017 Aug 1.
Published in final edited form as: Ann Surg. 2016 Aug;264(2):378–385. doi: 10.1097/SLA.0000000000001496

Figure 1.

Figure 1

Validation scheme for the Air Medical Prehospital Triage (AMPT) score. For each subject in the validation set, the AMPT score assigned them to either helicopter emergency medical services (HEMS) or ground emergency medical services (GEMS) transport; however within each of these groups, there were some subjects that actually were transported by HEMS and some that were actually transported by GEMS. Successful validation of the score occurred if subjects assigned to HEMS transport by the AMPT score had a significant survival benefit when actually transported by HEMS, while in subjects assigned to GEMS transport by the AMPT score, actual transport mode was not associated with survival.