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Table 2 Knockdown times (KDT) and mortality rates of An. gambiae s.l. populations exposed to 0.75% permethrin

From: Insecticide resistance in Anopheles gambiae from south-western Chad, Central Africa

District Village N Mortality
(%)
% KD after
1 h exposure
KDT50 in min
(95% CI)
KDT95 in min
(95% CI)
KDT50R*
Bongor Bongor 87 59.8(3) 87.4 35.1 (33.6–36.7) 74.1 (68.0–82.4) 2.17
  Goulmoun 90 26.7(3) 98.9 34.2 (33.1–35.3) 55.9 (53.1–59.6) 2.11
  Tchinfogo 94 48.9(3) 85.1 32.6 (30.7–34.4) 88.4 (78.2–103.6) 2.02
Guelendeng Guelendeng 92 100(1) 100 14.6 (13.6–15.5) 27.3 (25.4–29.9) 0.9
  Mbéré 92 67.9(3) ** 98.9 16.9 (15.6–18.1) 38.2 (35.2–42.1) 1.04
  Witi-Witi 82 96.3(2) 100 18.3 (17.4–19.2) 31.1 (29.2–33.6) 1.13
Kélo Kélo Urbain 97 76.3(3) 90.7 22.4 (20.2–24.5) 57.0 (49.9–67.8) 1.38
  Bologo 73 64.4(3) 94.5 24.8 (23.4–26.2) 54.8 (50.4–60.5) 1.54
  Kolon 88 89.8(2) 100 19.5 (18.5–20.5) 37.2 (34.8–40.2) 1.21
Kisumu Susceptible strain   100 100(1) ** 100 16.2 (15.2–17.1) 29.2 (27.3–31.7)  
  1. * KDT50R: KDT50 of the tested population divided by KDT50 of the Kisumu reference strain (1): susceptible; (2): resistance suspected; (3): resistant (WHO, 1998)
  2. ** Corrected with Abott's formula