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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.