The influence of age on insecticide susceptibility of Anopheles arabiensis during dry and rainy seasons in rice irrigation schemes of Northern Tanzania

Table 5 Knock-down time and mortality rates of Anopheles arabiensis exposed to Bendiocarb 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	94.0	91.7–96.3	59.3	57.5–61.2	125.2	119.7–131.3	4.5
2	Rain	800	95.7	94.0–97.5	25.7	24.5–26.9	57.4	54.1–61.0	2.0
3	Dry	800	95.3	92.9–97.6	47.5	46.2–48.9	100.3	96.3–104.7	3.6
3	Rain	800	96.8	95.4–98.1	25.1	24.1–26.2	56.1	53.1–59.4	1.9
5	Dry	800	98.0	97.1–98.9	44.1	42.7–45.6	93.1	89.1–97.6	3.3
5	Rain	800	98.8	97.7–99.8	26.8	24.3–29.4	59.8	54.1–66.3	2.1
10	Dry	800	99.3	98.4–100.1	28.9	28.1–29.9	61.2	58.8–63.8	2.2
10	Rain	800	99.8	99.1–100.4	39.2	37.7–40.7	87.5	82.8–92.8	3.0
Control^a	Dry	800	100	–	13.3	–	27.1	–	–
Control^a	Rain	800	100	–	12.9	–	27.3	–	–

ISSN: 1475-2875