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Maternal alcohol use during pregnancy and offspring attention-deficit hyperactivity disorder (ADHD): a prospective sibling control study

Eilertsen, Espen Moen; Gjerde, Line C.; Reichborn-Kjennerud, Ted; Ørstavik, Ragnhild; Knudsen, Gun Peggy; Stoltenberg, Camilla; Czajkowski, Nikolai Olavi; Røysamb, Espen; Kendler, Kenneth S; Ystrøm, Eivind
Journal article; AcceptedVersion; Peer reviewed
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manuscript_clean_fig.pdf (624.0Kb)
Year
2017
Permanent link
http://urn.nb.no/URN:NBN:no-75484

CRIStin
1468864

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Appears in the following Collection
  • Farmasøytisk institutt [1570]
  • Psykologisk institutt [3519]
  • Institutt for klinisk medisin [7651]
  • CRIStin høstingsarkiv [22284]
Original version
International Journal of Epidemiology. 2017, 46 (5), 1633-1640, DOI: https://doi.org/10.1093/ije/dyx067
Abstract
Background

Maternal alcohol use during pregnancy has repeatedly been associated with development of attention-deficit hyperactivity disorder (ADHD) in the offspring. It is, however not known whether this reflects a direct casual intra-uterine effect or a non-causal relationship due to confounding. We used three different approaches to control for measured and unmeasured confounding: statistical adjustment for covariates, negative control comparison against maternal pre-pregnancy alcohol use, and comparison among differentially exposed siblings.

Methods

The sample comprised 114 247 children (34 283 siblings) from 94 907 mothers, recruited to the Norwegian Mother and Child Birth Cohort Study between 1999 and 2008. Self-reported measurements of alcohol use were obtained in week 30 during the pregnancy. Mothers rated offspring ADHD symptoms at 5 years on two measures. Clinical ADHD diagnoses were obtained from the Norwegian Patient Registry.

Results

We found an overall positive association between maternal alcohol use during pregnancy and offspring ADHD symptoms, which was only marginally attenuated after inclusion of measured covariates. Both the negative control and the sibling comparison analysis further attenuated the estimated association, but it remained greater than zero [β

 = 0.017, 95% confidence interval (CI) = 0.005–0.030). No association was found between maternal alcohol use during pregnancy and offspring ADHD diagnosis.

Conclusions

For offspring ADHD symptoms we found a weak, but possibly causal association with maternal alcohol use during pregnancy, but no such effect was observed for clinical ADHD diagnosis.
 
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