Changes in objectively measured smoking in pregnancy by time and legislative changes in Finland: a retrospective cohort study.

BMJ Open · 2016 · PMC5168511 · PMID 27895067

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a decreasing trendno p-value reported

However, among women aged ≥30 years, there was a decreasing trend with an annual per cent change of −3.8% (95% CI −7.2% to −0.3%) until 2005 and an annual per cent change of −38.0% (95% CI −48.7% to −25.2%) since 2005.

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