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Table 4 - Format categories (all items in the 170 clinical journals, 161 of which were indexed in MEDLINE, were categorized for format)

Manual Review
Meets Criteria
Does Not Meet Criteria
Search Terms
Detected
a
b
Not detected
c
d
a + c
b + d

Sensitivity = a/(a+c);
Precision = a/(a+b);
Specificity = d/(b+d);
Accuracy = (a+d)/(a+b+c+d).
All articles classified during the manual review of the literature = (a+b+c+d).