Fig. 1

Comparison of mobile phone survey approaches. Using results from the regression output shown in Table 5, it is possible to estimate the difference in indicator values between the two survey approaches (RDD vs. opt-in method) for any base rate prevalence value. Given a strict decision rule to implement a mass distribution campaign once bed net access levels fall below a 50% threshold, a standalone opt-in survey methodology would erroneously trigger a campaign, assuming an RDD gold standard methodology, between prevalence values of 0.51 and 0.55 for households with at least one bed net per 2 de facto household population