A national survey of the prevalence of schistosomiasis and soil transmitted helminths in Malawi.

BMC Infect Dis · 2004 · PMC535894 · PMID 15546483

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a marked trendno p-value reported

haematobium now is not due to asymmetric sampling of low risk schools; it is due to a marked trend of a reduced prevalence across the board.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.