Evidence map›Paper›PMID 28102992›Full record

ArticleHealth promotion and chronic disease prevention in Canada : research, policy and practice2017

Environmental factors associated with autism spectrum disorder: a scoping review for the years 2003-2013.

M Ng, J G de Montigny, M Ofner, M T Do

Open access · diamondAbstract readScoping Review
In one paragraph

Article in Health promotion and chronic disease prevention in Canada : research, policy and practice, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 40 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
40citing papers in PubMed, 1 pooled it
4.6field-weighted citation impact, top 5% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

40 citing papers in PubMed, 1 synthesis or guideline pooled it, 94 citations in OpenAlex.

  1. Pooled it
  2. Maternal Thyroid Hormone Imbalance and Risk of Autism Spectrum Disorder.The Journal of clinical endocrinology and metabolism · 2026
    Article
  3. Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Expanding Research on Contextual Factors in Autism Research: What Took Us So Long?Autism research : official journal of the International Society for Autism Research · 2025
    Article
  11. Article
  12. The HPCDP Journal: celebrating a decade of impact.Health promotion and chronic disease prevention in Canada : research, policy and practice · 2025
    Article
  13. Article
  14. Review
  15. Article
  16. Review
  17. Article
  18. Article
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 3 institutions in 1 country.

M NgDalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.
J G de MontignyInstitute of Population Health, University of Ottawa, Ottawa, Ontario, Canada.
M OfnerDalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.
M T DoDalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.
University of Toronto · CAPublic Health Agency of Canada · CAUniversity of Ottawa · CA

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionThe number of children diagnosed with autism spectrum disorder (ASD) has been rapidly rising in the past decade. The etiology of this disorder, however, is largely unknown, although the environmental relative to the genetic contribution is substantial. We conducted a scoping review to comprehensively assess the current state of knowledge of the environmental factors present from preconception to early life associated with ASD, and to identify research gaps.

methodsWe searched electronic databases MEDLINE, PsycINFO and ERIC for articles on potential risk factors or protective factors from the physical and social environments associated with ASD and its subclassifications published between 1 January, 2003, and 12 July, 2013. We categorized articles into broad themes: chemical, physiological, nutritional and social factors, based on environmental exposure.

resultsWe identified over 50 000 publications, but after ineligible studies were screened out, 315 articles remained. Most of these studies examined physiological factors, followed closely by chemical factors, and to a much lesser extent, nutritional and social factors, associated with ASD. Despite a vast literature and many heterogeneous studies, several risk factors emerged consistently: chemical factors such as traffic-related air pollutants; physiological factors including advanced parental age, preterm birth, low birth weight, hyperbilirubinemia and clustering of pregnancy complications; and maternal immigrant status. Despite extensive research on vaccines, findings overwhelmingly demonstrate no support for an association with ASD.

conclusionThe lack of consistency, temporality and specificity of associations between environmental factors and ASD remains the largest barrier to establishing causal relationships. More robust research is required to resolve inconsistencies in the literature. Future research should explore underlying mechanisms of associations between the risk factors that we identified and ASD.

Indexed as

Autism Spectrum DisorderChildChild, PreschoolEnvironmental ExposureFemaleHumansMalePregnancyPregnancy ComplicationsRisk FactorsSociological FactorsASDautismautism spectrum disorderenvironmental exposureetiology

Identifiers

PMID28102992
PMCPMC5480297
OpenAlexW2580871841

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.