Skip to main content

Table 2 Sensitivity, specificity, predictive values of microscopy and Paracheck- Pf ® with PCR as gold standard

From: Performance of microscopy and RDTs in the context of a malaria prevalence survey in Angola: a comparison using PCR as the gold standard

   PCR PCR Sensitivity % Specificity % PPV % NPV %
Positive Negative (CI95) (CI95) (CI95) (CI95)
(n = 525) (n = 2,782)     
Microscopy Positive 315 210 60.0 92.5 60.0 92.5
(n = 525) (55.8-64.2) (91.4-93.4) (55.7-64.2) (91.4-93.4)
Negative 210 2,572
(n = 2,782)
Paracheck- Pf® Positive 382 158 72.8 94.3 70.7 94.8
(n = 540) (68.7-76.5) (93.4-95.2) (66.7-74.6) (93.9-95.6)
Negative 143 2,624
(n = 2,767)  
  P-value* <0.0001 <0.0001 <0.0001 <0.0001
  1. PPV: positive predictive value; NPV: negative predictive value.
  2. CI95: 95% confidence interval.
  3. *Obtained from McNemar test (sensitivity, specificity) / Weighted generalized score Chi-square test (PPV, NPV).