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Formulae for calculating the sensitivity, specificity, precision, and accuracy of searches for detecting sound clinical studies |
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| Manual Review (Hand search) |
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| Meets Criteria |
Does Not Meet Criteria |
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| Search Terms |
Detected |
a |
b |
| Not detected |
c |
d |
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| a + c |
b + d |
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a = true positives, articles found by the search term meet the criteria for purpose category (e.g., treatment) and methodologic rigor (i.e., "pass") b = false positives, articles found by the search term do not meet the criteria for purpose category and methodologic rigor c = false negatives, articles not found by the search term but did meet the criteria for purpose category and methodologic rigor d = true negatives, articles not found by the search term and did not meet the criteria for purpose category and methodologic rigor 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, n = (a+b+c+d). | |||
Wilczynski et al. BMC Medical Informatics and Decision Making 2005 5:20 doi:10.1186/1472-6947-5-20 |
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