Table 3.

Knock-down time and mortality rates of Anopheles arabiensis exposed to Deltamethrin for a period of 60 min in dry and rainy seasons

Age (days)	Season	Number tested	24 h mortality	95% CI	KDT50	95% CI	KDT95	95% CI	KDT50 ratio (RR)
2	Dry	800	44.5	39.9–49.2	36.6	34.3–37.9	101.2	94.6–37.9	2.9
	Rain	800	48.9	42.6–55.3	33.5	32.5–34.6	72.9	70.3–75.8	2.4
3	Dry	800	50.14	45.9–54.4	15.9	14.9–16.8	44.6	41.7–47.8	1.3
	Rain	800	52.4	46.4–58.5	30.9	30.0–31.9	67.3	64.9–69.9	2.2
5	Dry	800	49.9	44.4–55.4	32.7	31.8–33.7	71.1	68.6–73.8	2.6
	Rain	800	60.8	55.0–66.6	21.3	20.13–22.5	59.8	55.9–64.2	1.5
10	Dry	800	60.5	54.7–66.3	25.1	24.3–25.8	54.5	52.5–56.6	2.0
	Rain	800	71.9	67.0–76.9	27.9	26.8–29.0	78.3	73.9–83.4	2.0
Controla	Dry	800	100	–	12.5	–	19.8	–	–
	Rain	800	100	–	13.9	–	21.2	–	–

^aControl was Anopheles gambiae Kisumu strain aged 2 days old