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Table 4 2X2 contingency table for tests developed in the study. A – detection of tox gene, B – detection of dtxR

From: Application of loop-mediated isothermal amplification combined with colorimetric and lateral flow dipstick visualization as the potential point-of-care testing for Corynebacterium diphtheriae

A Gold standard 
  PositiveNegativeMeasures
Test resultsPositive90PPV
9/(9 + 0) × 100% = 100%
Negative042NPV
42/(0 + 42) ×  100% = 100%
 MeasuresSensitivity
9/(9 + 0) ×  100%
= 100%
Specificity 42/(0 + 42) ×  100%
= 100%
Accuracy
(9 + 42)/(9 + 0 + 0 + 42) ×  100% = 100%
B Gold standard 
  PositiveNegativeMeasures
Test resultsPositive390PPV
39/(39 + 0) × 100% = 100%
Negative012NPV
12/(0 + 12) × 100% = 100%
 MeasuresSensitivity
39/(39 + 0) × 100% = 100%
Specificity
12/(0 + 12) ×  100% = 100%
Accuracy
(39 + 12)/(39 + 0 + 0 + 12) = 100%