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Table 1 The national advisory committee on aeronautics (NACA)—score, used in Norwegian HEMS to classify severity of injury or sickness [22]

From: Mortality rates in Norwegian HEMS—a retrospective analysis from Central Norway

NACA 0

No injury or disease

NACA 1

Injuries/diseases without any need for acute physician’s care

NACA 2

Injuries/diseases requiring examination and therapy by a physician, but hospital admission is not indicated

NACA 3

Injuries/diseases without acute threat to life but requiring hospital admission

NACA 4

Injuries/diseases that can possibly lead to deterioration of vital signs

NACA 5

Injuries/diseases with acute threat to life

NACA 6

Injuries/diseases transported after successful resuscitation of vital signs

NACA 7

Lethal injuries or diseases (with or without resuscitation attempts)