Smoking trends among adolescents from 1990 to 2002 in ten European countries and Canada.

BMC Public Health · 2006 · PMC1654156 · PMID 17096837

Europe PMC DOI

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a decreasing trendno p-value reported

an increasing trendno p-value reported

Three daily smoking trend groups are identified: countries with a declining or stagnating trend, countries with an increasing trend followed by a decreasing trend, and countries with an increasing trend.

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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.