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Maternal smoking during pregnancy and child behaviour problems: the Generation R Study
Sabine J Roza1, Frank C Verhulst, Vincent W V Jaddoe
1The Generation R Study Group, Erasmus Medical Center Rotterdam, The Netherlands.
Insights
Maternal and paternal smoking during pregnancy may not directly cause child behavioral issues. Other parental factors like socioeconomic status and mental health appear to be the main influences, confounding the observed associations.
Area of Science:
- Perinatal Psychology
- Child Development
- Behavioral Genetics
Background:
- Maternal smoking during pregnancy is linked to offspring behavioral and emotional disorders.
- The causal nature of this association versus confounding factors remains unclear.
Purpose of the Study:
- To investigate the association between parental smoking during pregnancy and child behavioral problems.
- To determine if parental characteristics confound the relationship between prenatal smoke exposure and child behavior.
Main Methods:
- A population-based birth cohort study included 4680 children.
- Maternal and paternal smoking habits were self-reported during pregnancy.
- Child behavioral problems were assessed at 18 months using the Child Behavior Checklist.
Main Results:
- Maternal smoking during pregnancy was associated with increased risk of total and externalizing problems.
- Paternal smoking was also linked to higher behavioral problem risks.
- Adjustment for socioeconomic status and parental psychopathology fully accounted for the observed associations.
Conclusions:
- Parental smoking occurs within a context of other risk factors for child development.
- The association between parental smoking and child behavior may not be causal.
- Parental psychopathology is a critical factor to consider in studies on prenatal smoke exposure and behavior.
Background:
Several studies showed that maternal smoking in pregnancy is related to behavioural and emotional disorders in the offspring. It is unclear whether this is a causal association, or can be explained by other smoking-related vulnerability factors for child behavioural problems.
Methods:
Within a population-based birth cohort, both mothers and fathers reported on their smoking habits at several time-points during pregnancy. Behavioural problems were measured with the Child Behavior Checklist in 4680 children at the age of 18 months.
Results:
With adjustment for age and gender only, children of mothers who continued smoking during pregnancy had higher risk of Total Problems [odds ratio (OR) 1.59, 95% confidence interval (CI): 1.21-2.08] and Externalizing problems (OR 1.45, 95% CI: 1.15-1.84), compared with children of mothers who never smoked. Smoking by father when mother did not smoke, was also related to a higher risk of behavioural problems. The statistical association of parental smoking with behavioural problems was strongly confounded by parental characteristics, chiefly socioeconomic status and parental psychopathology; adjustment for these factors accounted entirely for the effect of both maternal and paternal smoking on child behavioural problems.
Conclusions:
Maternal smoking during pregnancy, as well as paternal smoking, occurs in the context of other factors that place the child at increased developmental risk, but may not be causally related to the child's behaviour. It is essential to include sufficient information on parental psychiatric symptoms in studies exploring the association between pre-natal cigarette smoke exposure and behavioural disorders.
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