Prevalence and intensity of infection with 95% confidence intervals were calculated using the SPSS (IBM, version 19) Complex Samples module taking into consideration the cluster nature of school children using district as strata and school as clusters.

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The prevalence of moderate-to-heavy intensity infections in school-aged children in sub-Saharan Africa appears to have reduced from 7·4% in 2000 to 1·0% by 2018 (figure 1C), with an estimated 15·6 million (95% CI 11·5 million to 21·8 million) cases in 2000A).

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