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Table 3 Sensitivity, specificity and predictive values of microscopy and Paracheck-Pf ® by age group 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

  Age Sensitivity % Specificity % PPV % NPV %
(CI95) (CI95) (CI95) (CI95)
Microscopy 0 - 5 68.4 92.7 67.8 92.9
(61.9-74.5) (90.9-94.2) (61.3-73.9) (91.1-94.4)
6 -15 60.6 91.6 62.6 91.0
(53.7-67.2) (89.7-93.4) (55.6-69.3) (88.9-92.7)
> 15 36.8 93.0 34.8 93.6
(26.7-47.8) (91.1-94.6) (25.2-45.4) (91.7-95.1)
P-value* <0.0001 0.5032 <0.0001 0.0897
Paracheck- Pf® 0 - 5 80.4 93.5 73.6 95.5
(74.7-85.4) (91.8-95.0) (67.6-79.0) (94.0-96.7)
6 - 15 76.5 93.3 72.4 94.5
(70.3-82.1) (91.5-94.8) (66.1-78.2) (92.8-95.9)
> 15 43.7 96.4 55.1 94.4
(33.1-54.7) (94.9-97.5) (42.6-67.1) (92.7-95.9)
P-value* <0.0001 0.0064 0.0088 0.4946
  1. Age shown in years; PPV: positive predictive value; NPV: negative predictive value.
  2. CI95: 95% confidence interval.
  3. *Obtained from Pearson Chi-squared test.