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Severity hierarchy

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he MAST Severity hierarchy is used to describe Severity in a consistent way. It is based on the acuity of injuries suffered by casualties as recorded in STATS19 returns.

There are two Severity dimensions in MAST: Casualty Severity and Crash Severity.

The Severity hierarchy has two levels. At the top level, the Fatal and Serious levels of severity are grouped together under the commonly used umbrella term KSI. At the lower level, these levels of severity are shown separately. Slight severity is always shown as a separate set. This structure may be represented as follows:

  • KSI (an abbreviation for 'Killed or Seriously Injured')
    • Fatal
    • Serious
  • Slight
  • Unknown (representing any instance where severity is missing from the STATS19 return, which should rarely if ever occur)
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