Filter | Manual review of each article | Â |
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 | Paramedic articles | Non-paramedic articles |  |
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Article identified | a | b | a + b |
Article not identified | c | d | c + d |
 | a + c | b + d | a + b + c + d |
- Caption: Sensitivity = a/(a + c): proportion of all articles relevant to paramedics in the reference set that are retrieved by the filter. Specificity = d/(b + d): proportion of all articles not relevant to paramedics in the reference set that are correctly not retrieved by the filter. Precision = a/(a + b). NNR = 1/precision: the number of relevant and non-relevant articles that need to be screened in order to find one of relevance