Maternal occupations linked to increased autism diagnosis odds
A large Danish study published in *Occupational and Environmental Medicine* found that maternal occupations in transportation and defense sectors were linked to higher odds of autism spectrum disorder (ASD) diagnosis in children born between 1973 and 2012. The research, analyzing 110,234 participants, suggests potential influences of toxicant exposure or stress from workplace environments during pregnancy and early infancy.
A new study published in *Occupational and Environmental Medicine* examined whether maternal occupations before and during pregnancy influence the likelihood of autism spectrum disorder (ASD) in children. Researchers analyzed data from 110,234 Danish children born between 1973 and 2012, including 1,702 ASD cases, using registry records and pension fund job histories. They categorized maternal occupations into seven sectors—service, transportation, goods/production, construction, public service, business/finance/hospitality, and STEM—and assessed exposure timing across critical developmental periods. The study found that children born to mothers working in transportation and defense sectors had higher odds of ASD diagnosis. Adjustments were made for factors like child sex, birth year, maternal age, and socioeconomic status, though the authors noted that occupational categories served as broad proxies for toxicant exposure rather than direct measurements. Limitations included lack of detailed job-task data and incomplete maternity leave records to confirm workplace presence during exposure windows. Previous research has linked maternal occupational exposure to toxic chemicals—such as exhaust, disinfectants, and solvents—to atypical neurodevelopment, though findings remain inconsistent. The current study addressed gaps by using longitudinal employment data, though it could not isolate specific chemical or stress-related factors. The authors emphasized the need for further research to clarify how workplace environments may impact prenatal health and neurodevelopmental outcomes. Denmark’s ASD prevalence rose significantly between 2004 and 2015, with higher rates observed in males. The study underscores the potential role of environmental factors alongside genetic influences in ASD etiology. While maternal occupations in transportation and defense sectors showed associations, the findings do not establish causation but highlight areas for targeted investigation into occupational hazards and prenatal health.
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