Amer J Perinatol
DOI: 10.1055/s-0037-1606583
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Timing of Maternal Tobacco Exposure, Hypertension, and Risk of Singleton Small-For-Gestational Age Infants

Sabrina Luke1, Russell S. Kirby1
  • 1Department of Community and Family Health, College of Public Health, University of South Florida, Tampa, Florida
Further Information

Publication History

01 August 2016

08 August 2017

Publication Date:
11 September 2017 (eFirst)

Abstract

Objective Small-for-gestational age infants are at an increased risk for disabilities and chronic health problems. Smoking and hypertension during pregnancy pose significant risks for fetal growth restriction. The study aims to identify whether (1) the timing of tobacco use modifies the risk of small-for-gestational age, (2) there are differences in association by percentile of small-for-gestational age (3rd, 5th, and 10th percentile), and (3) the effect of tobacco exposure on small-for-gestational age outcome is mediated by hypertension.

Methods Data were obtained from the 2009 Natality public use file available through the National Center for Health Statistics. Women were categorized into 11 groups depending on the trimester of tobacco exposure, the number of daily cigarettes smoked, and presence of hypertension. Multivariable log-linear regression models were performed to determine the association between percentile of singleton small-for-gestational age outcome (3rd, 5th, and 10th), trimester and degree of tobacco exposure, and hypertension.

Results Hypertension and smoking worked synergistically to restrict fetal growth. Hypertensive women who smoked heavily in all three trimesters were 4.34 times more likely to give birth to a 3rd percentile small-for-gestational age infant compared with nonsmoking normotensive women.

Conclusion The timing and duration of tobacco exposure mediates the risk and severity of fetal growth restriction.

Note

This study was conducted with data from the National Center for Health Statistics. Part of this study was presented at the American Public Health Association's Annual Meeting and Exposition; October 31–November 4, 2015; Chicago, IL.