Table 1. Performance of the cholera rapid diagnostic test, Pemba and Unguja, Zanzibar.
Sensitivity% (95%CI*) (TP/(TP+FN)) | Specificity% (95%CI*) (TN/(TN+FP)) | PPV% (95%CI*) (TP/(TP+FP)) | NPV% (95%CI*) (TN/(TN+FN)) | No. pos./total (%) with V. cholera isolated on stool culture | |
Total (n = 622) | 93.1 (88.7–96.2) (189/203) | 49.2 (44.3–54.1) (206/419) | 47.0 (42.1–52.0) (189/402) | 93.6 (89.6–96.5) (206/220) | 203/622 (32.6) |
Unguja (n = 79) | 89.1 (76.4–96.4) (41/46) | 51.5 (33.5–69.2) (17/33) | 71.9 (58.5–83.0) (41/57) | 77.3 (54.6–92.2) (17/22) | 46/79 (58.2) |
Pemba (n = 543) | 94.3 (89.4–97.4) (148/157) | 49.0 (43.9–54.1) (189/386) | 42.9 (37.6–48.3) (148/345) | 95.5 (91.5–97.9) (189/198) | 157/543 (28.9) |
p | 0.82 | 0.87 | 0.02 | 0.53 | <0.01 |
using exact method.