Table 1.
Number of Anopheles gambiae s.l. mosquitoes tested and percentage mortality observed in insecticide susceptibility tests.
| Study site | Variable | DDT (4%) |
Insecticide Permethrin (0.75%) |
Deltamethrin (0.05%) |
|---|---|---|---|---|
| Brikama | No. exposed | 160 | 150 | 155 |
| No. dead (%) | 160 (100) | 150 (100) | 155 (100) | |
| 95% CI$ | 97.8, 100 | 97.6, 100 | 97.6, 100 | |
| % alive An. arabiensis* | NA† | NA | NA | |
| Essau | No. exposed | 80 | 63 | 66 |
| No. dead (%) | 57 (71.3) | 56 (88.9) | 61 (92.4) | |
| 95% CI | 60.0, 80.8 | 78.4, 95.4 | 83.2, 97.5 | |
| % alive An. arabiensis | 100 | 85.7 | 75.0 | |
| Farafenni | No. exposed | 78 | 76 | 81 |
| No. dead (%) | 71 (91.0) | 72 (94.7) | 75 (92.6) | |
| 95% CI | 82.4, 96.3 | 87.1, 98.5 | 84.6, 97.2 | |
| % alive An. arabiensis | 100 | 75.0 | 83.3 | |
| Mansakonko | No. exposed | 22 | 18 | 22 |
| No. dead (%) | 21 (95.5) | 16 (88.9) | 22 (100) | |
| 95% CI | 77.2, 99.9 | 65.3, 98.6 | 84.6, 100 | |
| % alive An. arabiensis | 100 | 50 | NA | |
| Kuntaur | No. exposed | 38 | 41 | 38 |
| No. dead (%) | 38 (100) | 40 (97.6) | 37 (97.4) | |
| 95% CI | 84.6, 100 | 92.5, 100 | 91.9, 100 | |
| % alive An. arabiensis | NA | 100 | NA | |
| Basse | No. exposed | 22 | 19 | 20 |
| No. dead (%) | 22 (100) | 19 (100) | 20 (100) | |
| 95% CI | 84.6, 100 | 82.4, 100 | 83.2, 100 | |
| % alive An. arabiensis | NA | NA | NA |
$ 95% confidence interval calculated by the exact method
* % of surviving mosquitoes which were An. arabiensis. Other surviving mosquitoes were An. gambiae s.s.
† NA = not applicable/available