The Cribari Matric is used to assess undertriage and overtriage in a trauma center. It is comparable to the true positive and false negative rates.
Axes for 2x2 matrix:
(1) major trauma (ISS > 15, positive NFTI, or other criteria) vs minor trauma
(2) full trauma team activation or not
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Major Trauma (ISS > 15)
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Minor Trauma (ISS <= 15)
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Full Team Activated
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a
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b
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Full Team Not Activated
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c
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d
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undertriage = false negative rate =
= (number with full team not activated AND major trauma) / (total number with full trauma team not activated) =
= c / (c + d)
overtriage = false positive rate =
= (number activated and minor trauma) / (total with full trauma team activated) =
= b / (a + b)
correctly triaged =
= (a + d) / (a + b + c + d)
