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Table 3 Summary Statistics from the Pack Year and Cessation Date Algorithms

From: Building a tobacco user registry by extracting multiple smoking behaviors from clinical notes

Annotation a) Pack years regular expression extraction Annotation b) Cessation date regular expression extraction
Sensitivity: 91.7% Specificity: 95.2% Sensitivity: 63.2% Specificity: 94.6%
Pack year history found Pack year history not found Cessation date found Cessation date not found
Pack year history recorded 33 3 Cessation date recorded 12 7
No pack year history recorded 8 179 Cessation date not recorded 11 193
  1. Sensitivity, specificity, and crosstabulation of the annotation vs. the classification of a) the pack year algorithm and b) the cessation date algorithm