Maternal Cigarette Smoking during Pregnancy and Risk of Oral Clefts in Newborns

The results of previous epidemiologic research on the possible association between maternal smoking during pregnancy and risk of oral clefts in offspring have been inconsistent. This may be due in part to methodological limitations, including imprecise measurement of tobacco use, failure to consider...

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Veröffentlicht in:American journal of epidemiology 1999-10, Vol.150 (7), p.683-694
Hauptverfasser: Lieff, Susan, Olshan, Andrew F., Werler, Matha, Strauss, Ronald P., Smith, Jonna, Mitchell, Allen
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container_end_page 694
container_issue 7
container_start_page 683
container_title American journal of epidemiology
container_volume 150
creator Lieff, Susan
Olshan, Andrew F.
Werler, Matha
Strauss, Ronald P.
Smith, Jonna
Mitchell, Allen
description The results of previous epidemiologic research on the possible association between maternal smoking during pregnancy and risk of oral clefts in offspring have been inconsistent. This may be due in part to methodological limitations, including imprecise measurement of tobacco use, failure to consider etiologic heterogeneity among types of oral clefts, and confounding. This analysis, based on a large case-control study, further evaluated the effect of first trimester maternal smoking on oral facial cleft risk by examining the dose-response relationship according to specific cleft type and according to whether or not additional malformations were present. A number of factors, including dietary and supplemental folate intake and family history of clefts, were evaluated as potential confounders and effect modifiers. Data on 3, 774 mothers interviewed between 1976 and 1992 by the Slone Epidemiology Unit Birth Defects Study were used. Study subjects were actively ascertained from sites in areas around Boston, Massachusetts and Philadelphia, Pennsylvania; the state of Iowa; and southeastern Ontario, Canada. Cases were infants with isolated defects—cleft lip alone (n = 334), cleft lip and palate (n = 494), or cleft palate alone (n = 244)—and infants with clefts plus (+) additional malformations: cleft lip+ (n = 58), cleft lip and palate+ (n = 140), or cleft palate+ (n = 209). Controls were infants with defects other than clefts, excluding defects possibly associated with maternal cigarette use. There were no associations with maternal smoking for any oral cleft group, except for a positive dose response among infants with cleft lip and palate+ (for light smokers, odds ratio (OR) = 1.09 (95% confidence interval (Cl): 0.6, 1.9); for moderate smokers, OR = 1.84 (95% Cl: 1.2, 2.9); and for heavy smokers, OR = 1.85 (95% Cl: 1.0, 3.5), relative to nonsmokers). This finding may be related to the additional malformations rather than to the cleft itself. Am J Epidemiol 1999; 150: 683-94.
doi_str_mv 10.1093/oxfordjournals.aje.a010071
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This may be due in part to methodological limitations, including imprecise measurement of tobacco use, failure to consider etiologic heterogeneity among types of oral clefts, and confounding. This analysis, based on a large case-control study, further evaluated the effect of first trimester maternal smoking on oral facial cleft risk by examining the dose-response relationship according to specific cleft type and according to whether or not additional malformations were present. A number of factors, including dietary and supplemental folate intake and family history of clefts, were evaluated as potential confounders and effect modifiers. Data on 3, 774 mothers interviewed between 1976 and 1992 by the Slone Epidemiology Unit Birth Defects Study were used. Study subjects were actively ascertained from sites in areas around Boston, Massachusetts and Philadelphia, Pennsylvania; the state of Iowa; and southeastern Ontario, Canada. Cases were infants with isolated defects—cleft lip alone (n = 334), cleft lip and palate (n = 494), or cleft palate alone (n = 244)—and infants with clefts plus (+) additional malformations: cleft lip+ (n = 58), cleft lip and palate+ (n = 140), or cleft palate+ (n = 209). Controls were infants with defects other than clefts, excluding defects possibly associated with maternal cigarette use. There were no associations with maternal smoking for any oral cleft group, except for a positive dose response among infants with cleft lip and palate+ (for light smokers, odds ratio (OR) = 1.09 (95% confidence interval (Cl): 0.6, 1.9); for moderate smokers, OR = 1.84 (95% Cl: 1.2, 2.9); and for heavy smokers, OR = 1.85 (95% Cl: 1.0, 3.5), relative to nonsmokers). This finding may be related to the additional malformations rather than to the cleft itself. 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subjects abnormalities
Abnormalities, Multiple - epidemiology
Adult
Biological and medical sciences
Boston - epidemiology
Case-Control Studies
cleft lip
Cleft Lip - epidemiology
Cleft lip/palate
cleft palate
Cleft Palate - epidemiology
Confidence Intervals
Confounding Factors (Epidemiology)
Diseases of mother, fetus and pregnancy
Female
Gynecology. Andrology. Obstetrics
Humans
Infant, Newborn
intrauterine exposure
Iowa - epidemiology
Male
Medical sciences
multiple
Odds Ratio
Ontario - epidemiology
Philadelphia - epidemiology
Pregnancy
Pregnancy Trimester, First
Pregnancy. Fetus. Placenta
Risk Factors
Sex Distribution
smoking
Smoking - epidemiology
title Maternal Cigarette Smoking during Pregnancy and Risk of Oral Clefts in Newborns
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