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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)