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Table 2 Knockdown times and mortality rates for Anopheles gambiae field populations in Ndogpassi, Douala, after exposure to 4% DDT, 0.75% permethrin or 0.05% deltamethrin

From: High mosquito burden and malaria transmission in a district of the city of Douala, Cameroon

Insecticide

N

Knockdown times Kdt50 (95% CI) Min

Kdt95 (95% CI) Min

KdT50R

Mortality

4% DDT

249

226.5 (0.27 – 1849)

520.5 (0.01 – 25442)

12.04

33%

0.75% permethrin

350

110.7 (86.6 – 175)

389.8 (227.6 – 1094)

12

76%

0.05% deltamethrin

158

44.3 (42 – 47.02)

108.6 (94.9 – 129.7)

4.7

98%

  1. N: number of mosquitoes tested, Kd: knockdown times, Bold: resistant populations.
  2. Kdt50R: kdT50 of tested population divided by KdT50 of Kisumu strain.
  3. KdT50: Kd time in minutes for 50% mosquitoes.
  4. KdT95: Kd time in minute for 95% mosquitoes.
  5. Mortality: mortality rate 24 hours post exposure to the insecticide.