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Eur J Obstet Gynecol Reprod Biol. 2007 Dec;135(2):149-53. Epub 2007 Feb 27.

Prenatal weight gain following smoking cessation.

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Graduate Studies Program in Epidemiology, School of Medicine, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.



To evaluate the association of changes in smoking habit with maternal weight gain.


We questioned 4000 pregnant women > or =20 years about previous and current smoking habits during a second trimester visit to general prenatal clinics in 6 Brazilian cities, from 1991 to 1995, and followed their weight, through chart review, to term.


Of women who reported stopping smoking (915, 23% of the total), 240 (26.2%) stopped during pregnancy. The median number of cigarettes smoked/day among those who reported continued smoking (717, 18%) decreased from 10 to 5 with pregnancy. In linear regression models adjusting for age, educational attainment, ethnicity, prepregnancy body mass index, parity and clinical center, ex-smokers gained 1.03 kg (95%CI 0.59-1.46) more than those reporting never smoking, this difference being greater: 1.54 kg (95%CI 0.78-2.30) in those who reported quitting while pregnant. The size of weight gain in both continuing smokers and ex-smokers was proportional to the reduction in daily number of cigarettes smoked during pregnancy, being 0.38 kg (95%CI 0.07-0.68) greater for each 10 cigarettes reduced (p=0.007).


Decreasing the quantity of cigarettes smoked in pregnancy, although important for maternal and child health, is associated with maternal weight gain.

[Indexed for MEDLINE]

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