Table 2.
Knockdown times (KDTs) for Anopheles gambiae s.l. in The Gambia after exposure to different insecticides.
| Insecticide | Study site | n @ | KDT50 (CL#) | KDT95 (CL#) |
|---|---|---|---|---|
| DDT (4%) | Brikama | 166 | 26.1 (17.0–34.1) | 68.3 (67.9–148.9) |
| Essau | 80 | 46.1 (42.4–50.8) | 126.6 (102.1–174.3) | |
| Farafenni | 80 | 28.7 (26.3–30.8) | 63.9 (56.9–75.1) | |
| Mansakonko | 22 | 30.1 (25.5–34.2) | 64.3 (53.1–92.3) | |
| Kuntaur | 39 | 22.7 (20.1–25.1) | 47.0 (41.2–56.7) | |
| Basse | 25 | 28.6 (24.6–32.5) | 67.5 (55.4–93.4) | |
| Permethrin (0.75%) | Brikama | 150 | 27.6 (21.6–31.8) | 52.3 (47.8–74.7) |
| Essau | 63 | 14.3 (10.9–17.3) | 85.0 (64.5–132.0) | |
| Farafenni | 76 | 6.9$ | 54.7$ | |
| Mansakonko | 18 | 15.0 (10.9–18.6) | 42.6 (33.6–63.2) | |
| Kuntaur | 41 | 1.0* | 17.2* | |
| Basse | 19 | 9.2 (5.2–11.8) | 21.9 (16.9–40.7) | |
| Deltamethrin (0.05%) | Brikama | 155 | 25.1 (17.1–32.1) | 67.8 (64.0–131.4) |
| Essau | 66 | 10.8 (9.4–12.0) | 21.7 (18.9–26.7) | |
| Farafenni | 88 | 8.3 (6.6–9.6) | 18.7 (16.2–23.6) | |
| Mansakonko | 22 | 5.6* | 16.8* | |
| Kuntaur | 38 | 3.3 (0.2–6.8) | 24.3 (16.8–50.6) | |
| Basse | 20 | 16.3 (12.7–19.5) | 41.3 (33.9–55.8) |
@ Total number of mosquitoes exposed to each insecticide.
# 95% confidence limits
$ The linear log-time probit model is not a good fit to the data in this case. Therefore the estimates of KD50 and KD95 are unlikely to be accurate and the confidence limits could not be estimated
* Lower and upper confidence limits could not be estimated due to large g value [25]