TITLE

Low Birthweight at Term and the Timing of Fetal Exposure to Maternal Smoking

AUTHOR(S)
Lieberman, Ellice; Gremy, Isabelle; Lang, Janet M.; Cohen, Amy P.
PUB. DATE
July 1994
SOURCE
American Journal of Public Health;Jul1994, Vol. 84 Issue 7, p1127
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Objectives. This study was undertaken to evaluate the risk of small-for-gestational-age birth for women who stop smoking or begin to smoke during pregnancy. Methods. Women with term singleton pregnancies from a hospital-based cohort of 11 177 were classified as (1) nonsmokers; (2) smoked throughout pregnancy; (3) smoked during first trimester only; (4) smoked during first and second trimesters during first and second trimesters only; and (5) smoked during second and third trimesters or during third trimester only. Risk of small-for-gestational-age birth according to smoking category was estimated and adjusted for confounding factors by logistic regression. Results. Women who stopped smoking by the third trimester were not at increased risk of small-for-gestational-age birth compared with nonsmokers. Women who began smoking during the second or third trimester had an elevated risk of small-for-gestational-age birth (odds ratio [OR] = 1.83; 95% confidence interval [CI] = 1.25, 2.67) similar to that for women who smoked throughout pregnancy (OR = 2.20; 95% CI = 1.90; 2.54). Risk of small-for-gestational-age birth increased with the number of cigarettes smoked during the third trimester. Conclusions. It is during the third trimester that smoking retards fetal growth, presenting a compelling opportunity for smoking cessation interventions. Programs must emphasize the importance of not resuming smoking late in pregnancy.
ACCESSION #
9408031442

 

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