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Maternal body mass index during early pregnancy, gestational weight gain, and risk of autism spectrum disorders: Results from a Swedish total population and discordant sibling study.
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BACKGROUND: Prenatal environmental factors such as maternal adiposity may influence the risk of offspring autism spectrum disorders (ASD), though current evidence is inconsistent. The objective of this study was to assess the relationship of parental BMI and gestational weight gain (GWG) with risk of offspring ASD in a population-based cohort study using family-based study designs. METHODS: The cohort was based in Stockholm County, Sweden, including 333,057 individuals born 1984-2007, of whom 6420 were diagnosed with an ASD. We evaluated maternal body mass index (BMI) at first antenatal visit, GWG and paternal BMI at the time of conscription into the Swedish military as exposures using general estimating equation (GEE) models with logit link. RESULTS: At the population level, maternal overweight/obesity was associated with increased risk of offspring ASD [odds ratio (OR)25 ≤ BMI < 30 1.31, 95% confidence interval = 1.21-1.41; ORBMI ≥ 30 1.94, 1.72-2.17], as was paternal underweight (ORBMI < 18.5, 1.19, 1.06-1.33) and obesity (ORBMI ≥ 30 1.47, 1.12-1.92) in mutually adjusted models. However, in matched sibling analyses, the relationship between elevated maternal BMI and ASD risk was not apparent. GWG had a U-shaped association with offspring ASD at the population level (ORinsufficient 1.22, 1.07-1.40; ORexcessive 1.23, 1.08-1.40). Matched sibling analyses were suggestive of elevated risk with excessive GWG (ORinsufficient 1.12, 0.68-1.84; ORexcessive 1.48, 0.93-2.38). CONCLUSIONS: Whereas population-level results suggested that maternal BMI was associated with ASD, sibling analyses and paternal BMI analyses indicate that maternal BMI may also be a proxy marker for other familial risk factors. Evidence is stronger for a direct link between GWG and ASD risk.
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“To calculate CIs, instead of relying on the assumption that estimates follow an asymptotic normal distribution, we calculated 2-sided 95% CIs using profile likelihood methods.23”
From Association of Genetic and Environmental Factors With Autism in a 5-Country Cohort (2019) · cites this paper as [23]
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“Some studies that did assess gestational weight gain found it was not related to neurodevelopmental outcomes beyond prepregnancy weight (59,65), whereas others found significant positive associations with neurodevelopmental outcomes (44,52,58,62).”
BackgroundMethodMaternal obesity and neurodevelopmental and psychiatric disorders in offspring
Edlow, A. G. (2016) · Prenatal Diagnosis · doi:10.1002/pd.4932 · Cited by 326
“with offspring ASD risk, even in those studies that failed to find an association with maternal pre-pregnancy obesity.(26,27) Paternal obesity has also been demonstrated to be independently associated with increased ASD risk in offspring.”
MethodResult
Metadata
- Authors
- Gardner, R. M., Lee, B. K., Magnusson, C., Rai, D., Frisell, T., Karlsson, H., Idring, S., & Dalman, C.
- Affiliations
- Karolinska Institutet (SE)
- Drexel University (US)
- Region Stockholm (SE)
- Avon and Wiltshire Mental Health Partnership NHS Trust (GB)
- Corresponding author
- Gardner, Renee M
- Venue
- International Journal of Epidemiology
- Publisher
- Oxford University Press (OUP)
- Published
- 2015-06
- Volume
- 44
- Issue
- 3
- Pages
- 870-883
- ISSN
- 0300-5771 (ISSN-L)
- 1464-3685
- PMC
- PMC4521130
- OpenAlex
- W1902120875
- Cited by
- 141
- References
- 67
- Citations by year
- 2026: 7 · 2025: 10 · 2024: 16 · 2023: 16 · 2022: 7 · 2021: 8 · 2020: 22 · 2019: 14 · 2018: 15 · 2017: 13 · 2016: 12 · 2015: 1
- FWCI
- 8.22
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- cc-by-nc
- Locations
- International Journal of Epidemiology (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Bristol Research (University of Bristol) (publishedVersion)
- Funders
- Autism Speaks
- Forskningsrådet för Arbetsliv och Socialvetenskap (2007-2064)
- Stockholms Läns Landsting (2007008)
- Vetenskapsrådet (523‐2010‐1052)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
- Health Sciences › Medicine › Obstetrics and Gynecology › Gestational Diabetes Research and Management
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Birth, Development, and Health
- Keywords
- autism spectrum disorder, maternal body mass index, gestational weight gain, maternal obesity, paternal BMI, prenatal environmental exposure, family risk factors
- MeSH terms
- Autism Spectrum Disorder, Adolescent, Adult, Birth Weight, Child, Child, Preschool, Female, Humans, Male, Obesity, Pregnancy, Pregnancy Complications, Risk Factors, Sweden, Cohort Studies, Weight Gain, Body Mass Index, Odds Ratio, Siblings, Pregnant People, Young Adult
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