How Many Time-Critical Emergencies? A Population-Based National Estimate of Attended Events per 100,000 US Residents

Objectives. To estimate how many time-critical emergencies fire and emergency medical services (EMS) crews attend each year per 100,000 US residents. We counted events in which a crew reached a living patient or a trapped person whose outcome plausibly depends on how soon effective treatment starts. Methods. For 30 medical conditions, we took annual counts from US registries and datasets, or multiplied a national incidence count by the share of patients EMS attended. A condition was Tier A when a published study linked a measured delay, from minutes to a few hours, to death or major disability

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