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Table 7 Relative effects of adding different IRS treatments in huts with different LLIN types

From: Comparative field evaluation of combinations of long-lasting insecticide treated nets and indoor residual spraying, relative to either method alone, for malaria prevention in an area where the main vector is Anopheles arabiensis

  Adding IRS with pirimiphos methyl Adding IRS with lambda cyhalothrin Adding IRS with DDT
   RR (95% CI) P value RR (95% CI) P value RR (95% CI) P value
Huts with Untreated nets Dry season 2.200 (1.734 – 2.792) < 0.001 1.920 (1.582 – 2.330) < 0.001 1.730 (1.398 – 2.140) < 0.001
  Wet season 2.208 (1.821 – 2.677) < 0.001 1.551 (1.274 – 1.887) < 0.001 1.444 (1.181 – 1.766) < 0.001
Huts with Olyset® nets Dry season 2.218 (1.194 – 4.118) = 0.012 1.717 (0.965 – 3.055) = 0.538 0.940 (0.510 – 1.732) = 0.843
  Wet season 1.375 (1.143 – 1.654) = 0.001 1.075 (0.889 – 1.301) = 0.455 1.174 (0.968 – 1.425) = 0.103
Huts with PermaNet 2.0® nets Dry season 2.264 (1.218 – 4.207) = 0.010 1.313 (0.734 – 2.349) = 0.359 0.920 (0.524 – 1.797) = 0.924
  Wet season 1.420 (1.179 – 1.710) < 0.001 1.173 (0.969 – 1.419) = 0.103 1.031 (0.849 – 1.253) = 0.756
Huts with Icon Life® nets Dry season 1.401 (1.169 – 1.680) < 0.001 1.093 (0.922 – 1.295) = 0.306 0.767 (0.636 – 0.925) = 0.006
  Wet season 1.237 (1.029 – 1.486) = 0.023 1.008 (0.835 – 1.217) = 0.972 0.995 (0.821 – 1.205) = 0.958
  1. The table shows relative rates (RR) and associated 95% confidence intervals of increased mortality of Anopheles arabiensis in huts with LLINs plus IRS, compared to huts with nets alone.