The impact of changing cigarette smoking habits and smoke-free legislation on orofacial cleft incidence in the United Kingdom: Evidence from two time-series studies.

PLoS One · 2021 · PMC8612573 · PMID 34818369

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a decreasing trendno p-value reported

It is not clear why - although a decreasing trend was already present - we should not have expected a change in slope after the smoking ban implementation.

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