Data management and statistical analysis
REGRESSION
Household data collected during the census and surveys were captured on electronic forms using smartphones installed with OpenDataKit (ODK) Collect. Entomological data were collected on pre- designed data collection forms and then double-entered into pre-established Microsoft Excel databases. All data are stored on a secure server located at the CREC/LSHTM Facility in Benin. Count data on mosquito densities was analysed by comparing log transformed cluster level rates using linear regression. Terms for matched pair and baseline density were included. This method was used because other methods for clustered data, such as random effect models, do not perform well with only 8 clusters per armIn situ wall cone bioassay knockdown and mortality data was pooled across households of each substrate type for each arm and plotted against the number of months since spraying and residual efficacy of each IRS treatment was expressed as the number of months for which overall mortality for each mosquito species and each wall substrate type remained ≥ 80%.