Table 1.

Mean mortality rate and mean knockdown time (min) for the median (50%) in a batch of 11Anopheles mosquitoes in 10 replicates exposed to K-othrine (Deltamethrin 25 mg/m²), Solfac EW50 (Cyfluthrin 50 mg/m²)and Fendona 6SC (Cypermethrin 50 mg/m²) impregnated mosquito nets.

Year	Deltamethrin		Cyfluthrin		Cypermethrin		Control*
	KDT50 mortality	%	KDT50 mortality	%	KDT50 mortality	%	KDT50 mortality	%
1998	19.2	100	21.7	90.2	20.3	88.7	19	100
1999	23.9	100	22.6	89.14	24.2	86	21.2	100
2000	25.4	100	28.1	82.7	27.6	78	20	100
2001	33.6	89.1	42.3	80.7	40.8	74.5	22	100
2002	38.5	90.2	51.5	77	52.8	72.5	23.2	80
2003	46.2	82	56.7	74	61.7	67.3	22	90
2004	50.8	76.1	62.9	66	67.4	69.5	21.4	89
2005	62.1	74	72.4	64.5	74.6	66.2	22.5	85.5
2006	65.9	69.8	77.3	61	83.2	60.8	25	80
2007	72.7	65.2	90.2	56.6	88.4	58.4	24.5	80
Mean	43.83	84.64	52.57	74.18	54.10	72.19	22.08	90.45

* Deltamethrin