Houses sprayed in the last five rounds of IRS on Bioko Island (2017–2021).

Den = Denominator; Cov = Coverage; Under = Undersprayed; Over = Oversprayed; Prod = Productivity. Percentages and inter-quartile ranges (IQR) are within square brackets. †Percent relative to the number of houses sprayed. ‡Productivity is expressed as the median and IQR of houses sprayed per sprayer per day. Statistical significance of differences with the preceding round were determined by α < 0.05 in the test of proportions (marked ⋆⋆) and in the Wilcoxon-Mann-Whitney test (marked ⋆).