Table 2.
The results of a ROC analysis to determine the cutoff for the qFTS ratios using vFTS results as the reference standard
| Sensitivity | Specificity | Correctly classified | PPV | NPV | PLR | NLR | |
|---|---|---|---|---|---|---|---|
| qFTS | |||||||
| 0.27 | 96.0 | 80.0 | 94.1 | 97.1 | 74.1 | 4.8 | 0.05 |
| 0.30 | 94.9 | 84.0 | 93.6 | 97.7 | 70.0 | 5.9 | 0.06 |
| 0.35 | 91.0 | 84.0 | 90.1 | 97.6 | 56.8 | 5.7 | 0.11 |
| 0.40 | 90.4 | 88.0 | 90.1 | 98.2 | 56.4 | 7.5 | 0.11 |
| 0.43 | 89.8 | 92.0 | 90.1 | 98.8 | 56.1 | 11.2 | 0.11 |
NLR = negative likelihood ratio; NPV = negative predictive value; PPV = positive predictive value; PLR = positive likelihood ratio; ROC = receiver operating characteristic; vFTS = visual Filariasis Test Strip; qFTS = quantitative Filariasis Test Strip ratios.
Sensitivity, specificity, correctly classified, PPV, and NPV results are expressed as percentages.