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Maternal pre-pregnancy body mass index and offspring attention deficit hyperactivity disorder: a population-based cohort study using a sibling-comparison design
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden.
Department of Social Sciences–Psychology, Mid Sweden University, Östersund, Sweden; Department of Epidemiology and Biostatistics, Imperial College London, London, UK; Medical Research Council Social Genetic Developmental Psychiatry Centre, King’s College London, London, UK.
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2014 (English)In: International Journal of Epidemiology, ISSN 0300-5771, E-ISSN 1464-3685, Vol. 43, no 1, 83-90 p.Article in journal (Refereed) Published
Abstract [en]

Background: High maternal pre-pregnancy body mass index (BMI) is associated with increased risk of offspring attention deficit hyperactivity disorder (ADHD). However, the role of unmeasured familial confounding for this association remains unclear.

Methods: We conducted a population-based cohort study via linkage of Swedish national and regional registers to investigate maternal pre-pregnancy BMI (underweight: BMI <18.5; overweight: 25≤ BMI <30; obesity: BMI ≥30) in relation to offspring ADHD. We followed 673 632 individuals born in Sweden between 1992 and 2000, with prospectively collected information on maternal pre-pregnancy BMI, until they received an ADHD diagnosis or ADHD medication, death, emigration or 31 December 2009. Hazard ratios (HRs) were estimated by Cox proportional hazards models. Stratified Cox proportional hazards models were applied to data on full siblings to control for unmeasured familial confounding.

Results: At the population level, pre-pregnancy overweight/obesity was associated with increased risk of offspring ADHD (HR(overweight) = 1.23, 95% CI = 1.18-1.27, P = 0.01; HR(obesity) = 1.64, 95% CI = 1.57-1.73, P = 0.01), after adjustment for measured covariates. In full sibling comparisons, however, previously observed associations no longer remained (HR(overweight) = 0.98, 95% CI = 0.83-1.16, P = 0.82; HR(obesity) = 1.15, 95% CI = 0.85-1.56, P = 0.38).

Conclusions: The results suggested that the association between maternal pre-pregnancy overweight/obesity and offspring ADHD could be ascribed to unmeasured familial confounding.

Place, publisher, year, edition, pages
Oxford, United Kingdom: Oxford University Press, 2014. Vol. 43, no 1, 83-90 p.
Keyword [en]
ADHD, maternal BMI, prenatal, confounding, sibling comparison
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:oru:diva-54557DOI: 10.1093/ije/dyt152ISI: 000332341300016PubMedID: 24058000Scopus ID: 2-s2.0-84896894290OAI: oai:DiVA.org:oru-54557DiVA: diva2:1064365
Funder
Swedish Research Council
Note

Funding Agencies:

Swedish Council for Working Life and Social Research 

National Institute of Child Health and Human Development 

Available from: 2017-01-12 Created: 2017-01-12 Last updated: 2017-01-30Bibliographically approved

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Citation style
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