Table 2.

Performance characteristics of ICT P.f/P.v relative to those of microscopy for 560 patients with a presumptive clinical diagnosis of malaria

Microscopy resultSensitivity (% [95% CIa])Specificity (% [95% CI])PPV (% [95% CI])NPV (% [95% CI])Accuracy (%)J indexLikelihood ratio
Positive testNegative test
Total96.3 (93.2–98.1)79.4 (74.2–83.9)81.7 (76.9–85.7)95.8 (92.2–97.9)87.70.764.70.06
P. falciparum, asexual (±sexualb)95.5 (92.0–97.6)89.8 (85.7–92.8)88.1 (83.4–91.6)96.2 (93.2–98.0)92.30.859.40.05
P. vivax, asexual (±sexual)75 (57.5–87.3)94.8 (92.5–96.5)50.0 (36.3–63.7)98.2 (96.5–99.1)93.60.7014.40.26
  • a CI, confidence interval.

  • b ±sexual, with or without sexual-stage parasites.