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Table 1 National committee on Aeronautics (NACA) score, used to decide severity of illness

From: Management of chest pain: a prospective study from Norwegian out-of-hours primary care

Score level Patient status
NACA 0 No injury or illness
NACA 1 Not acute life-threatening disease or injury
NACA 2 Acute intervention not necessary, further diagnostic studies needed
NACA 3 Severe, but not life threatening disease or injury; acute intervention necessary
NACA 4 Development of vital (life threatening) danger possible
NACA 5 Acute vital (life threatening) danger
NACA 6 Acute cardiac or respiratory arrest
NACA 7 Death