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Table 3 Knockdown time (KDT50) of An. arabiensis mosquitoes to three insecticide classes

From: Effects of agricultural pesticides on the susceptibility and fitness of malaria vectors in rural south-eastern Tanzania

  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)
  1. V1 = Minepa, V2 = Lupiro, V3 = Kisawasawa, V4 = Njage
  2. 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)