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Table 3 Cross tabulation of RDT with microscopy test results, and performance of the RDT

From: Comparison of visual and automated Deki Reader interpretation of malaria rapid diagnostic tests in rural Tanzanian military health facilities

RDT (any band) Microscopy Total RDT performance
Positive Negative
DR analysis
 Positive 589 188 777 Sensitivity = 589/626 * 100 = 94.1%
 Negative 37 479 516 Specificity = 479/667 * 100 = 71.8%
 Total 626 667 1293 PPV = 589/777 * 100 = 75.8%
    NPV = 479/516 * 100 = 92.8%
Visual interpretation
 Positive 585 184 769 Sensitivity = 585/626 * 100 = 93.5%
 Negative 41 483 524 Specificity = 483/667 * 100 = 72.4%
 Total 626 667 1293 PPV = 585/769 * 100 = 76.1%
    NPV = 483/524 * 100 = 92.2%
  1. DR, Deki Reader; PPV, positive predictive value; NPV, negative predictive value