Selection and the effect of prenatal smoking

Authors

  • Angela R. Fertig

    Corresponding author
    1. Department of Health Policy and Management, University of Georgia, Athens, GA, USA
    • Department of Health Policy and Management, University of Georgia, 201 North Milledge Avenue, Athens, GA 30602, USA
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Abstract

There is a debate about the extent to which the effect of prenatal smoking on infant health outcomes is causal. Poor outcomes could be attributable to mother characteristics, which are correlated with smoking. I examine the importance of selection on the effect of prenatal smoking by using three British cohorts where the mothers' knowledge about the harms of prenatal smoking varied substantially. I find that the effect of smoking on the probability of a low birth weight birth conditional on gestation is slightly more than twice as large in 2000 compared with 1958, implying that selection could explain as much as 50% of the current association between smoking and birth outcomes. Copyright © 2009 John Wiley & Sons, Ltd.

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