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Table 5 Hypothetical illustration of infection prevalence by ITN use and by resistance stratum demonstrating loss of effectiveness expressed as an odds ratio

From: Design of a study to determine the impact of insecticide resistance on malaria vector control: a multi-country investigation

Deltameth. resistance (2012) of clusters (no. of clusters) ITN-use Infection prevalence, % (N) ITN effectiveness Effect modification of resistance on effectiveness
Odds ratio ITN-use versus no net use Change in effectiveness ratio, (high versus low resistance)
Low resistance (mortality ≥80%) No 49 1  
Yes 27 0.4 1
High resistance (mortality <80%) No 37 1  
Yes 30 0.7 1.75 [1.1–5.0]