Table 3. Comparison of the field and laboratory performance of the cholera dipstick test.
(n = 67) | 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. (%) with V. cholera isolated on stool culture** |
Field | 90.0 (76.3–97.2) (36/40) | 55.6 (35.3–74.5) (15/27) | 75.0 (60.4–86.4) (36/48) | 78.9 (54.4–93.9) (15/19) | 40 (59.7) |
Laboratory | 87.5 (73.2–95.8) (35/40) | 74.1 (53.7–88.9) (20/27) | 83.3 (68.6–93.0) (35/42) | 80.0 (59.3–93.2) (20/25) | 40 (59.7) |
P *** | 0.931 | 0.510 | 0.740 | 0.977 |
using exact method.
rapid diagnostic testing was done both in the field and in the laboratory on specimens from the same stool samples.
using McNemars test.