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Table 2 Sensitivity, specificity, positive predictive values (PPV), and negative predictive values (NPV) of microscopy by age category, as well as the overall sensitivity, specificity, PPVs and NPVs using RDTs as the gold standard

From: Over-diagnosis of malaria by microscopy in the Kilombero Valley, Southern Tanzania: an evaluation of the utility and cost-effectiveness of rapid diagnostic tests

Age Sensitivity Specificity PPV NPV
  (95% CI) (95% CI) (95% CI) (95% CI)
Less than 1 1.00 0.27 0.11 1.00
(0.01 – 1.00) (0.06 - 0.61) (0.00-0.48) (0.19 – 1.00)
1-5 1.00 0.19 0.14 1.00
(0.55 – 1.00) (0.11 -0.31) (0.07 - 0.25) (0.66 – 1.00)
6-18 0.88 0.24 0.17 0.92
(0.64 - 0.99) (0.16- 0.34) (0.10-0.27) (0.74 -0.99)
19+ 1.00 0.27 0.20 1.00
(0.82 – 1.00) (0.20-0.35) (0.14 -0.28) (0.87 – 1.00
Overall 0.96 0.25 0.18 0.98
  (0.87-1.00) (0.20 - 0.30) (0.14- 0.22) (0.92 – 1.00)