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Table 1 Two by Two table of the results of the negation mapping compared with the initial human review. The "C" prior to the operator signifies Computer identification (e.g. Cnegative). True negation is based on the human review that served as our gold standard.

From: A controlled trial of automated classification of negation from clinical notes

 

True Negation

True (Positive or Uncertain)

CNegative

1662

161

Cpositive Or Cuncertain

48

12921