Changes in childhood vaccination coverage over time in the Democratic Republic of the Congo.

PLoS One · 2019 · PMC6534301 · PMID 31125375

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an overall trendno p-value reported

Similarly, there was an overall trend across both DHS waves where as year of birth increased, so did vaccination coverage.

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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.