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Table 7 Indoor and outdoor densities of the malaria vector species, An. arabiensis and An. funestus mosquitoes in houses with different characteristics in Ifakara town and its adjacent wards

From: Dramatic decreases of malaria transmission intensities in Ifakara, south-eastern Tanzania since early 2000s

House characteristics No. houses (N) Mean no. An. arabiensis per house [LCI–UCI] Mean no. An. funestus per house [LCI–UCI] t-test P-value
Indoor mosquito densities (association of vector densities with electricity)
 Without electricity 53 59.1 [27.9–90.3] 4.63 [2.2–7.1] <0.05
 With electricity 57 7.3 [4.6–10.0] 0.18 [− 0.03–0.4]
Outdoor mosquito densities (association of vector densities with electricity)
 Without electricity 53 67.2 [18.0–116.4] 2.6 [0.2–4.9] <0.05
 With electricity 57 12.0 [1.7–22.6] 0.3 [0.1–0.5]
Indoor mosquito densities (association of vector densities with window covering)
 Windows covered with netting screen 57 14.8 [7.0–22.6] 1.6 [0.4–2.8] <0.05
 Windows covered with wood or metal 19 24.0 [18.1–29.9] 0.8 [− 0.2–1.8]
 Windows covered with bricks 18 36.1 [11.5–83.7] 3.6 [− 1.3–8.5]
 Windows covered with cardboard/clothes 15 75.3 [4.3–146.3] 5.4 [0.2–10.7]
 Windows uncovered 1 471.0 [471.0–471.0] 3.0 [3.0–3.0]