Supplementary file 1_Evaluating indoor residual spraying in Côte d’Ivoire: the role of routine malaria data quality.docx

We seek to identify potential factors that could compromise the quality of routine malaria incidence and determine how impact quantification of IRS on malaria incidence depends on data quality by emphasizing robust counterfactuals with contemporaneous covariates.</p>Methods<p>Using mixed-effect models and correlation analysis we compare data from two sources (routine surveillance and re-digitized registries).

To quantify decrease in incidence post intervention, we apply Bayesian structural time series analysis with posterior feature selection to determine impact confounders.</p>Results<p>The presence of IRS, test positivity and reporting rates are significant factors impacting data quality. For high-quality data, we estimate a 12% resp. 19% decrease in incidence rate 1 year after the intervention, while for low-quality data estimates are 30% resp. 42%.