Table 3.
Knockdown time (KDT50) of An. arabiensis mosquitoes to three insecticide classes
| Organochloride | Pyrethroids | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| DDT | Permethrin | Lambda-cyhalothrin | |||||||
| KDT50 | % Mortality | RR (95% CI) | KDT50 | % Mortality | RR (95% CI) | KDT50 | % Mortality | RR (95% CI) | |
| Lab-reared | 31.5 (30.0–32.9) | 98.75 | 1 | 17.2 (16.0–18.5) | 97.5 | 1 | 9.0 (6.4–11.0) | 97.5 | 1 |
| V1 | 43.9 (41.7–46.0) | 100 | 1.4 (1.4–1.4) | 37.1 (34.6–39.6) | 25 | 1.9 (1.8–1.9) | 38.0 (33.6–43.6) | 78.75 | 4.2(4.0–5.2) |
| V2 | 35.5 (33.3–37.5) | 98.75 | 1.13 (1.1–1.1) | 28.5 (26.1–30.9) | 63.75 | 1.6 (1.6–1.6) | 17.3 (14.1–20.4) | 85 | 1.9 (1.9–2.2) |
| V3 | 28.6 (26.4–30.9) | 100 | 0.9 (0.9–0.9) | 18.3 (16.8–19.8) | 89.71 | 1.5 (1.4–1.5) | 18.4 (15.2–21.4) | 85 | 2.04 (1.9–2.4) |
| V4 | 26.5 (24.4–28.7) | 100 | 0.8 (0.8–0.9) | 21.5 (20.0–23.1) | 100 | 1.3 (1.2–1.4) | 19.4 (18.5–20.3) | 98.5 | 2.2 (1.8–2.9) |
V1 = Minepa, V2 = Lupiro, V3 = Kisawasawa, V4 = Njage
DDT dichloro-diphenyl-trichloroethane, CI confidence interval, KDT50 knockdown time (50%), KDT90 knockdown time (90%), RR resistance ratio (KDT50 of exposed group ÷ KDT50 of the susceptible group)