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

Parasites & Vectors

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

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

CI confidence interval
***Significant difference in mortality between irrigated and non-irrigated areas

ISSN: 1756-3305