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Table 1 Time required for 50% of the population to be knocked down (LT 50 ) and resistance ratio relative to the susceptible strain (RR 50 ) of different age groups of wild An. gambiae mosquitoes from Tiassalé following exposure to five insecticides

From: Increase in susceptibility to insecticides with aging of wild Anopheles gambiaemosquitoes from Côte d’Ivoire

Insecticide Age (days) LT50 95% confidence interval RR50
Deltamethrin *Kisumu (1–2) 15.18 (14.45-15-88) 1
  1 62.28 (57.46-71.03) 4.1
  2 80.93 (69.37-102.37) 5.33
  3 73.23 (65.20-86.94) 4.82
  5 72.7 (65.42-85.32) 4.79
  10 45.67 (43.84-47-90) 3.01
Permethrin Kisumu (1–2) 14.59 (13.96-15.20) 1
  1 164.04 (105.91-497.81) 11.24
  2 179.01 (109.02-743.01) 12.27
  3 193.31 (112.62-951.82) 13.25
  5 129.18 (94.19-292.32) 8.85
  10 69.64 (63.50-79.50) 4.77
DDT Kisumu (1–2) 21.37 (20.70-21.03) 1
  1 +∞ na na
  2 +∞ na na
  3 +∞ na na
  5 201.2 (115.24-1129.87) 9.42
  10 +∞ na na
Malathion Kisumu (1–2) 24.93 (24.11-25.73) 1
  1 61.79 (56.86-69.04) 2.48
  2 54.66 (51.22-59.37) 2.19
  3 63.76 (58.59-71.63) 2.56
  5 38.31 (35.99-41.13) 1.54
  10 48.77 (46.08-52.24) 1.96
Propoxur Kisumu (1–2) 27.09 (26.06-28.09) 1
  1 +∞ na na
  2 +∞ na na
  3 +∞ na na
  5 64.61 (56.97-78.75) 2.39
  10 74.61 (67.48-89.31) 2.75
  1. *Reference susceptible An. gambiae s.s. strain aged 1 to days old; na: not available; +∞: infinity.