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Table 4 Indoor mosquito densities in field experimental huts that had mosquito coils and DDT compared to huts that did not have insecticides (n = 64 nights)

From: An experimental hut study to quantify the effect of DDT and airborne pyrethroids on entomological parameters of malaria transmission

Treatment N Median IQR RR 95% CI z value p value
Anopheles arabiensis
No insecticide 5650 70.00 50.25 – 104.50 NA NA NA NA
Transfluthrin coils 3881 47.00 27.25 – 75.25 0.62 [0.47 - 0.87] -6.37 <0.001
Metofluthrin coils 4249 54.00 35.50 – 82.00 0.70 [0.50 - 0.98] -4.77 <0.001
DDT 2gm2 5813 67.00 41.50 – 108.75 0.92 [0.65 - 1.20] -1.22 0.224
Culex quinquefasciatus
No insecticide 2300 26.00 19.50 – 46.25 NA NA NA NA
Transfluthrin coils 1782 26.50 13.00 – 39.25 0.87 [0.73 - 1.05] -1.46 0.143
Metofluthrin coils 1645 22.50 13.75 – 36.25 0.72 [0.61 - 0.85] -3.80 <0.001
DDT 2gm2 2102 27.00 16.75 – 44.00 1.13 [1.01 - 1.28] -1.40 0.161
Mansonia spp.
No insecticide 947 12.00 8.75 NA NA NA NA
Transfluthrin coils 150 2.00 1.00 0.16 [0.07 - 0.19] -8.17 <0.001
Metofluthrin coils 185 2.00 0.75 0.12 [0.09 - 0.24] -7.56 <0.001
DDT 2gm2 734 9.00 5.75 0.50 [0.33 - 0.77] -3.16 0.002
  1. Legend: The table illustrates reduction of indoor mosquitoes when huts were treated with coils and DDT, N- Total number of mosquitoes; Median – number of mosquitoes per hut per night; IQR – Interquartile range; RR – Relative rate; CI – Confidence intervals.