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Table 1 Cross-tabulation for reference standard (RS = target condition) and test result (PSP-test), absolute and relative frequencies

From: Detection of colon polyps by a novel, polymer pattern-based full blood test

PSP-Test RS All
D- D+
N % N % N %
T- 99 62.3 8 27.6 107 56.9
T+ 60 37.7 21 72.4 81 43.1
All 159 100.0 29 100.0 188 100.0
Diagnostic accuracy (Sens, spec)
Sens: 72.4% (width of Cl: 52.8%.. 87.3%)
Spec: 62.3% (width of Cl: 54.2%.. 69.8%)
Missings RS  
D- D+
Total 159 + 6 = 165 29 + 22 = 51 188 + 28 = 216 Total 159 + 6 = 165 29 + 22 = 51
Prev: 23.6%
Diagnostic accuracy (predictive values acc. Bayes theorem)
PPV: 37.2% (width of Cl: 30.5%.. 44.5%)
NPV: 88.0% (width of Cl: 80.0%. 93.0%)
Unknown RS 17 17
Total   233