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Occupational exposures and amyotrophic lateral sclerosis. A population-based case-control study
V McGuire1, W T Longstreth, L M Nelson
1Department of Epidemiology, School of Public Health and Community Medicine, University of Washington, Seattle 98195-9775, USA.
American Journal of Epidemiology
|June 15, 1997
Summary
Exposure to agricultural chemicals may increase the risk of developing amyotrophic lateral sclerosis (ALS). This risk appears higher in men with significant exposure, suggesting a link between occupational chemical exposure and ALS.
Area of Science:
- Environmental Health
- Neuroepidemiology
- Occupational Medicine
Background:
- Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease with multifactorial etiology.
- Workplace exposures are suspected contributors to ALS risk, but specific agents remain under investigation.
Purpose of the Study:
- To investigate the association between occupational exposures to metals, solvents, and agricultural chemicals and the risk of ALS.
- To identify specific workplace risk factors for amyotrophic lateral sclerosis.
Main Methods:
- A population-based case-control study in western Washington State (174 ALS cases, 348 controls).
- Industrial hygienists blindly assessed lifetime job histories for chemical exposures.
- Matched case-control analysis adjusted for age and education.
Main Results:
- Ever exposure to agricultural chemicals was associated with an increased odds of ALS (OR=2.0).
- This association was significant in men (OR=2.4) but not in women (OR=0.9).
- A dose-response trend was observed for agricultural chemical exposure in men (p=0.03).
Conclusions:
- Findings suggest a potential association between agricultural chemical exposure and ALS risk, particularly in men.
- No significant associations were found for exposures to metals or solvents.
- Further research is warranted to confirm these occupational exposure links to ALS.