Favaretto Ana L, Duncan Bruce B, Mengue Sotero S, Nucci Luciana B, Barros Enrique F, Kroeff Locimara R, Vigo Alvaro, Schmidt Maria I
Graduate Studies Program in Epidemiology, School of Medicine, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
Eur J Obstet Gynecol Reprod Biol. 2007 Dec;135(2):149-53. doi: 10.1016/j.ejogrb.2006.11.014. Epub 2007 Feb 27.
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.
评估吸烟习惯的改变与孕妇体重增加之间的关联。
1991年至1995年期间，我们在巴西6个城市的普通产前诊所对4000名年龄≥20岁的孕妇进行了询问，了解她们既往和当前的吸烟习惯，这些询问是在孕期中期进行的。随后，通过查阅病历，跟踪她们直至足月时的体重情况。
报告戒烟的女性（915名，占总数的23%）中，有240名（26.2%）在孕期戒烟。报告继续吸烟的女性（717名，占18%）中，每天吸烟的中位数从怀孕前的10支降至5支。在对年龄、教育程度、种族、孕前体重指数、产次和临床中心进行校正的线性回归模型中，已戒烟者比报告从不吸烟的女性体重多增加1.03千克（95%可信区间为0.59 - 1.46），在孕期戒烟的女性中这一差异更大，为1.54千克（95%可信区间为0.78 - 2.30）。继续吸烟者和已戒烟者的体重增加幅度均与孕期每日吸烟量的减少成正比，每减少10支烟，体重增加幅度就会多0.38千克（95%可信区间为0.07 - 0.68）（p = 0.007）。
孕期减少吸烟量虽然对母婴健康很重要，但与孕妇体重增加有关。
