Health Information Research Unit - HIRU ~ Format Categories

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).