The prevalence of and factors associated with urinary cotinine-verified smoking in Korean adults: The 2008-2011 Korea National Health and Nutrition Examination Survey.

PLoS One · 2018 · PMC5995458 · PMID 29889856

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a decreasing trendno p-value reported

The weighted prevalence of cotinine-verified smoking showed a decreasing trend with increasing age irrespective of the threshold urinary cotinine level.

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