Text messaging for maternal and infant retention in prevention of mother-to-child HIV transmission services: A pragmatic stepped-wedge cluster-randomized trial in Kenya.

PLoS Med · 2019 · PMC6774469 · PMID 31577792

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The sentences

an apparent trendno p-value reported

Finally, it was not possible to distinguish a real secular trend from an apparent trend caused by improvement in the intervention over time with this study design.

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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.