Table 4 Performance of rapid diagnostic tests for malaria diagnosis in Djibouti city, 2018–2021
From: Molecular investigation of malaria-infected patients in Djibouti city (2018–2021)
Performance | Year1 | |||||||
|---|---|---|---|---|---|---|---|---|
2018 | 2019 | 2020 | 2021 | |||||
n | % | n | % | n | % | n | % | |
P. falciparum | ||||||||
True positive | 55 | 71 | 27 | 14 | 62 | 22 | 174 | 47*** |
False positive | 11 | 14 | 6 | 3 | 6 | 2 | 25 | 6.7* |
True negative | 12 | 15 | 85 | 45 | 76 | 26 | 111 | 29 |
False negative | 0 | 0 | 69 | 37 | 144 | 50 | 64 | 17*** |
Total | 78 | 100 | 187 | 100 | 288 | 100 | 374 | 100 |
Sensitivity | 100 | 28.1 | 30.1 | 73.1*** | ||||
Specificity | 52.2 | 93.4 | 92.7 | 81.6* | ||||
PPV | 83.3 | 81.8 | 91.2 | 87.7 | ||||
NPV | 100 | 55.2 | 34.6 | 63.4 | ||||
Accuracy | 85.9 | 59.9 | 47.9 | 76.5 | ||||
P. vivax | ||||||||
True positive | 9 | 12 | 27 | 14 | 23 | 8 | 23 | 6* |
False positive | 1 | 1 | 4 | 2 | 3 | 1 | 67 | 17.9*** |
True negative | 62 | 79 | 147 | 79 | 254 | 88 | 272 | 73 |
False negative | 6 | 8 | 9 | 5 | 8 | 3 | 12 | 3 |
Total | 78 | 100 | 187 | 100 | 288 | 100 | 374 | 100 |
Sensitivity | 60.0 | 75.0 | 74.2 | 65.7 | ||||
Specificity | 98.4 | 97.3 | 98.8 | 80.2*** | ||||
PPV | 90.0 | 87.1 | 92.0 | 51.1 | ||||
NPV | 98.4 | 94.2 | 98.4 | 97.1 | ||||
Accuracy | 97.3 | 93.0 | 97.9 | 90.8 | ||||