Table 2.
Accuracy of rapid immunochromatographic assays against ELISA stratified by testing facility
| Parameter | Specificity | Sensitivity | J-Index | PPV | NPV | LR+ | LR- | RR |
|---|---|---|---|---|---|---|---|---|
| Hepatitis B virus | ||||||||
| Total | 97.8 | 97.0 | 1.0 | 84.2 | 99.6 | 43.2 | 0.0 | 8.11 (0.01-16.65) |
| Agogo | 97.7 | 100 | 1.0 | 87.5 | 100 | 43.0 | 0.0 | 0.00 (0.00-40.44) |
| Bekwai | 95.6 | 100 | 1.0 | 71.4 | 100 | 22.5 | 0.0 | 0.00 (0.00-48.91) |
| KATH | 96.4 | 93.8 | 0.9 | 83.3 | 98.8 | 26.3 | 0.1 | 15.0 (0.01-30.31) |
| KNUST | 100 | 100 | 1.0 | 100 | 100 | NA | 0.0 | 0.00 (0.00-83.25) |
| Sunyani | 100 | 100 | 1.0 | 100 | 100 | NA | 0.0 | 0.00 (0.00-54.59) |
| Hepatitis C Virus | ||||||||
| Total | 97.2 | 25.0 | 0.2 | 27.3 | 96.9 | 9.0 | 0.8 | 68.75 (46.15-91.73) |
| Agogo | 91.3 | 25.0 | 0.2 | 20.0 | 93.3 | 2.9 | 0.8 | 62.50 (28.91-96.59) |
| Bekwai | 91.3 | 0.0 | -0.1 | 0.0 | 91.3 | 0.0 | 1.1 | 75.00 (45.41-100) |
| KATH | 100 | 50.0 | 0.5 | 100 | 98.0 | NA | 0.5 | 50.00 (15.00-85.00) |
| KNUST | 100 | NA | NA | NA | 100 | NA | 1.0 | NA |
| Sunyani | 100 | NA | NA | NA | 100 | NA | 1.0 | NA |
| Human Immuno virus | ||||||||
| Total | 88.9 | 100 | 0.9 | 8.3 | 100 | 9.0 | 0.0 | 0.00 (0.00-61.75) |
| Agogo | 79.6 | 100 | 0.8 | 9.1 | 100 | 4.9 | 0.0 | 0.00 (0.00-83.25) |
| Bekwai | 72.0 | NA | -0.5 | 0.0 | 100 | 0.0 | 1.4 | NA |
| KATH | 93.9 | 100 | 0.9 | 14.3 | 100 | 16.5 | 0.0 | 0.00 (0.00-83.25) |
| KNUST | 100 | NA | NA | NA | 100 | NA | 1.0 | NA |
| Sunyani | 93.9 | 100 | 0.9 | 25.0 | 100 | 16.3 | 0.0 | 0.00 (0.00-83.25) |
Data are presented as number. ELISA = enzyme immunosoebent assay; J-Index = Youden's statistic Index; LR+ = likelihood ratio positive; LR- = likelihood ratio negative; RR = residual risk; KATH = Komfo Anokye Teaching Hospital; KNUST = Kwame Nkrumah University of Science and Technology; NA = could not be calculated.