Table 1.
The sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of reported blood in urine in (a) identifying school with prevalence >50% and (b) in diagnosing children infected with Schistosoma haematobium on the Kenyan coast, 2008–2009. Exact 95% binomial confidence intervals in parenthesis
| Overall | |
|---|---|
| (a) Schools | |
| Sensitivity | 91.7 (61.5–99.7) |
| Specificity | 100 (92.7–100) |
| PPV | 100 (71.5–100) |
| NPV | 98.0 (89.3–99.9) |
| (b) Children | ||||
|---|---|---|---|---|
| All ages | Age <10 years | Age 10–12 years | Age 13+ years | |
| Boys | ||||
| Sensitivity | 57.8 (54.2–61.2) | 52.9 (42.8–62.9) | 57.5 (52.1–62.7) | 59.4 (54.1–64.6) |
| Specificity | 90.0 (88.7–91.2) | 92.3 (88.9–94.9) | 90.9 (89.0–92.7) | 88.2 (86.0–90.2) |
| PPV | 67.0 (63.3–70.5) | 67.5 (56.1–77.6) | 69.2 (63.5–74.5) | 64.8 (59.3–87.7) |
| NPV | 85.8 (84.4–87.2) | 86.7 (82.7–90.0) | 85.8 (83.5–87.8) | 85.6 (83.2–87.7) |
| Girls | ||||
| Sensitivity | 39.0 (35.4–42.7) | 35.2 (26.8–44.4) | 40.5 (35.2–45.9) | 38.8 (32.7–45.1) |
| Specificity | 93.6 (92.6–94.6) | 91.5 (88.4–94.0) | 94.5 (93.0–95.8) | 93.8 (91.8–95.1) |
| PPV | 64.7 (59.9–69.2) | 54.4 (42.8–65.7) | 70.4 (63.5–76.7) | 62.6 (54.5–70.2) |
| NPV | 83.7 (82.3–85.1) | 83.0 (79.3–86.3) | 83.2 (80.9–85.2) | 84.7 (82.3–86.9) |