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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.