TABLE 1 | A 2×2 table to evaluate test performance
From the following article:
Evaluation of diagnostic tests for infectious diseases: general principles
Shabir Banoo, David Bell, Patrick Bossuyt, Alan Herring, David Mabey, Freddie Poole, Peter G Smith, N. Sriram, Chansuda Wongsrichanalai, Ralf Linke, Rick O'Brien, Mark Perkins, Jane Cunningham, Precious Matsoso, Carl Michael Nathanson, Piero Olliaro, Rosanna W. Peeling & Andy Ramsay
Nature Reviews Microbiology 5, S21-S31 (November 2007)
doi:10.1038/nrmicro1523
| Test under evaluation | Reference standard test | Total | |
|---|---|---|---|
| Positive | Negative | ||
| Positive | a | b | a + b |
| Negative | c | d | c + d |
| Total | a + c | b + d | |
| Test sensitivity = a/(a + c); test specificity = d/(b + d); PPV = a/(a + b); NPV = d/(c + d). | |||
| a = true positive, b = false positive; c = false negative; d = true negative | |||
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