The effect of the year of study period remained highly significant in the multivariable model.
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Smoking among pregnant women in Cantabria (Spain): trend and determinants of smoking cessation.
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The sentences
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.