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Table 6 Relative effects of adding different types of LLINs into huts with different IRS treatments

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

  Olyset® nets added PermaNet 2.0® nets added Icon Life® nets added
   RR (95% CI) P value RR (95% CI) P value RR (95% CI) P value
Unsprayed huts Dry season 1.315 (1.172 – 1.590) < 0.001 2.300 (1.981 – 2.672) < 0.001 2.177 (1.914 – 2.477) < 0.001
  Wet season 1.328 (1.119 – 1.470) < 0.001 1.654 (1.575 – 1.736) < 0.001 1.545 (1.415 – 1.688 < 0.001
Huts sprayed with DDT Dry season 0.997 (0.769 – 1.129) = 0.232 1.184 (0.998 – 1.404) = 0.052 1.221 (0.823 – 1.532) = 0.079
  Wet season 1.172 (0.972 – 1.323) = 0.093 1.181 (1.056 – 1.320) = 0.003 1.227 (0.823 – 1.621) = 0.081
Huts sprayed with Lambda cyhalothrin Dry season 0.841 (0.739–0.956) = 0.008 1.461 (1.285 – 1.662) < 0.001 1.239 (1.094 – 1.405) < 0.001
  Wet season 1.157 (0.921 – 1.454) = 0.210 1.698 (1.354 – 2.129) < 0.001 1.433 (1.190 – 1.725) < 0.001
Huts sprayed with Pirimiphos methyl Dry season 0.994 (0.866–1.141) = 0.930 1.773 (1.544 – 2.036) < 0.001 1.387 (1.224 – 1.571) < 0.001
  Wet season 1.321 (1.126 – 1.549) = 0.001 1.262 (1.075 – 1.481) = 0.004 1.386 (1.182 – 1.626) < 0.001
  1. The table shows relative rates (RR) and associated 95% confidence intervals of increased mortality of Anopheles arabiensis in huts with IRS plus LLINs, compared to huts with IRS supplemented only with untreated nets.