Smoking among pregnant women in Cantabria (Spain): trend and determinants of smoking cessation.

BMC Public Health · 2007 · PMC1868717 · PMID 17466062

Europe PMC DOI

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highly significantno p-value reported

The effect of the year of study period remained highly significant in the multivariable model.

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a slight trendno p-value reported

The mean number of cigarettes/day (cig/d) before pregnancy remained constant, around 16 cig/d, whereas a slight trend to increase over time was seen, from 7.7 to 8.9 cig/d.

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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.