Nationwide rollout reveals efficacy of epidemic control through digital contact tracing.

Nat Commun · 2021 · PMC8505561 · PMID 34635661

Europe PMC DOI

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a slightly increasing trendno p-value reported

The trend of risky contacts closely followed that of all contacts, and both numbers exhibited a slightly increasing trend, which is consistent with the fact that society was slowly opening up during this period.

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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.