Table 3

 Method for calculating* sensitivity, specificity, precision, and accuracy of PubMed/Medline searches for detecting occupational health intervention studies

Gold standard
+
*Sensitivity  =  a/(a+c), specificity  =  d/(b+d), precision  =  a/(a+b), accuracy  =  (a+d)/(a+b+c+d).
Cell definitions: true positives  =  a, false positives  =  b, false negatives  =  c, true negatives  =  d.
Search term(s)+ab
cd