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A Systematic Review and Meta-analysis of Prenatal, Birth, and Postnatal Factors Associated with Attention-Deficit/Hyperactivity Disorder in Children

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Abstract

Previous studies have shown mixed results on the relationship between prenatal, birth, and postnatal (“pregnancy-related”) risk factors and attention-deficit/hyperactivity disorder (ADHD). We conducted meta-analyses to identify potentially modifiable pregnancy-related factors associated with ADHD. A comprehensive search of PubMed, Web of Science, and EMBASE in 2014, followed by an updated search in January 2021, identified 69 articles published in English on pregnancy-related risk factors and ADHD for inclusion. Risk factors were included in the meta-analysis if at least three effect sizes with clear pregnancy-related risk factor exposure were identified. Pooled effect sizes were calculated for ADHD overall, ADHD diagnosis, inattention, and hyperactivity/impulsivity. Odds ratios (OR) were calculated for dichotomous measures and correlation coefficients (CC) for continuous measures. Prenatal factors (pre-pregnancy weight, preeclampsia, pregnancy complications, elevated testosterone exposure), and postnatal factors (Apgar score, neonatal illness, no breastfeeding) were positively associated with ADHD overall; the findings for ADHD diagnosis were similar with the exception that there were too few effect sizes available to examine pre-pregnancy weight and lack of breastfeeding. Prenatal testosterone was significantly associated with inattention and hyperactivity/impulsivity. Effect sizes were generally small (range 1.1–1.6 ORs, -0.16–0.11 CCs). Risk factors occurring at the time of birth (perinatal asphyxia, labor complications, mode of delivery) were not significantly associated with ADHD. A better understanding of factors that are consistently associated with ADHD may inform future prevention strategies. The findings reported here suggest that prenatal and postnatal factors may serve as potential targets for preventing or mitigating the symptoms of ADHD.

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Acknowledgements

The authors would like to acknowledge Lu (Mary) Meng, Ph.D., and Jaleal Sanjak, Ph.D. for their assistance in creating the Forest Plots for these analyses.

Funding

National Center on Birth Defects and Developmental Disabilities,ID04130157.

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Correspondence to Rebecca H. Bitsko.

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All authors report no potential conflicts of interest.

Research Involving Human Participants and/or Animals

This study includes analyses of data previously published in the literature.

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Bitsko, R.H., Holbrook, J.R., O’Masta, B. et al. A Systematic Review and Meta-analysis of Prenatal, Birth, and Postnatal Factors Associated with Attention-Deficit/Hyperactivity Disorder in Children. Prev Sci (2022). https://doi.org/10.1007/s11121-022-01359-3

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  • DOI: https://doi.org/10.1007/s11121-022-01359-3

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