The impact of COVID-19 certification mandates on the number of cases of and hospitalizations with COVID-19 in the UK: A difference-in-differences analysis.

Front Public Health · 2023 · PMC9998475 · PMID 36908465

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a decreasing trendno p-value reported

A decreasing trend in the difference's plots (on the left) is associated with a protective effect of the intervention date on the outcome.

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