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Definitions of diagnostic parameters
| Major Trauma | Minor Trauma | Total | |
|---|---|---|---|
| Red code | a | b | a + b |
| Yellow code | c | d | c + d |
| Total | a + c | b + d | N |
Sensitivity = a/ (a + c); specificity = d/(b + d); PPV = a/ (a + b); NPV = d/ (c + d) undertriage = c/a + c; overtriage = b/ a + b
