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Table 2 Modified NACA scale dichotomized in 2 groups, as used in Geneva’s SBD system

From: Emergency physician’s dispatch by a paramedic-staffed emergency medical communication centre: sensitivity, specificity and search for a reference standard

  National Advisory Committee for Aeronautics (NACA) levels
Symptoms usually not requiring an emergency physician on site NACA 0 No injury or disease
NACA 1 Injury/disease without any need for acute physician care
NACA 2 Injury/disease requiring examination and therapy by a physician, but hospital admission is not indicated
NACA 3 Injury/disease without threat of life but requiring hospital admission
NACA 7 no res Lethal injury or disease without resuscitation attempted
+/− NACA 4 Injury/disease which can possibly lead to deterioration of vital signs
Symptoms usually requiring an emergency physician on site NACA 5 Injury/disease with acute threat of life
NACA 6 Injury/disease transported after an out-of-hospital cardiac arrest
NACA 7 res Lethal injuries or disease with resuscitation attempted (without transportation)