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Table 1 The status of phenotypic resistance of Anopheles arabiensis and the estimated time to 50% mortality (KDT50) when exposed to insecticides for 60 min in the irrigated and non-irrigated areas in 2018 and 2019

From: Insecticide resistance status of Anopheles arabiensis in irrigated and non-irrigated areas in western Kenya

Insecticide Year Zone Sample size KDT50(min) Adjusted mortality rate (%) (95% CI)
Deltamethrin 2018 Irrigated 324 13.0 97.8 (96.2, 99.4)***
Non-irrigated 114 20.9 84.0 (77.3, 90.7)
2019 Irrigated 180 23.2 78.2 (72.2, 84.2)
Non-irrigated 117 21.5 83.3 (76.5, 91.1)
PBO-Deltamethrin 2019 Irrigated 86 8.2 100 (100, 100)
Non-irrigated 76 7.6 100 (100, 100)
DDT 2019 Irrigated 107 26.1 99.0 (97.1, 100)
Non-irrigated 123 24.2 100 (100, 100)
Malathion 2018 Irrigated 104 27.0 100 (100, 100)
Non-irrigated 158 23.2 100 (100, 100)
2019 Irrigated 158 18.0 100 (100, 100)
Non-irrigated 111 21.1 100 (100, 100)
  1. CI confidence interval
  2. ***Significant difference in mortality between irrigated and non-irrigated areas