| Relevant article | Non-relevant article |
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Search
| Articles found | a | b |
 | Articles not found | c | d |
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Recall (also referred to as sensitivity in diagnostic test terminology) a/(a+c), the proportion of relevant articles that were found by the search compared to the total number of relevant articles.
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Precision (also referred to as positive predictive value in diagnostic test terminology) a/(a+b), the proportion of relevant articles that were found by the search compared to the total number of articles found by the search.
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Specificity d/(b+d), proportion of articles not found by the search that are not relevant.