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Psychological symptoms and quality of life among residents exposed to long-term, low-dose environmental manganese (Mn)
Citation:
Garcia, R., M. Morivasu, R. Bowler, AND D. Lobdell. Psychological symptoms and quality of life among residents exposed to long-term, low-dose environmental manganese (Mn). International Neuropsychological Society, Denver, CO, February 04 - 07, 2015.
Impact/Purpose:
This study addresses research questions under Sustainable and Healthy Communities (2.2.1.6 lessons learned, best practices and stakeholder feedback from community and tribal participative case studies). This Regional Applied Research Effort project is a joint effort between Region 5 and ORD Scientists that examined neurotoxic effects of Mn within two communities: a high level air exposure community (East Liverpool, Ohio) and a mid to low range air exposure community (Marietta, Ohio). This work is important in that either positive results (differences between the high level air Mn exposure community and comparison communities) or negative results (little or no differences among communities) inform the issue of potential health effects of residential airborne Mn exposure, a recognized gap in Mn health effects literature. Both outcomes can also help inform the need for greater airborne Mn control.
Description:
Objective: Elevated levels of air manganese (air-Mn) exposure have been associated with adverse health effects. This study examined the relationship of air-Mn concentrations with mood and quality of life.Participants and methods: 185 residents (age mean (M)=55.13±10.88; education yrs M=13.77±2.60; residence yrs M=41.01±16.91) exposed to long-term air-Mn from two Ohio towns, and 90 residents (age M=55.53±10.96; education yrs M=15.18±3.04; residence yrs M=33.59±17.25) from an unexposed Ohio town completed the Healthy Days Measures of the BRFSS, and the Symptom Checklist-90-Revised (SCL-90-R). In the SCL-90-R, “caseness” is defined as at least two symptom dimensions at or above 90th percentile of the normative population. Air-Mn concentrations were estimated over ten years using the U.S. EPA’s AERMOD dispersion model. ANCOVA, chi-square and regression analyses were used with years of residence and education as covariates.Results: The exposed towns had proportionally more residents with ≥2 elevated SCL-90-R dimensions (“cases”) than the unexposed town (χ²=3.602, p=.058). Air-Mn concentrations were associated with higher levels of Anxiety (β=.162, p=.031) and higher Positive Symptom Distress (β=.147, p=.048). Obsessive-compulsive (β=.137, p=.071) and Psychoticism (β=.136, p=.072) approached significance. Air-Mn concentrations were associated with poor mental health in the past 30 days (β=.168, p=.026). Exposed “case” residents compared to exposed “non-case” residents had significantly more days of poor physical health (M=7.23±9.72 vs. 3.61±8.37, p=.013) and poor mental health (M=9.27±10.05 vs. 2.24±4.84, p<.001). Exposed “case” residents had more days of physical and mental health limiting daily activities (M=4.55±8.27 vs. 0.76±3.07, p<.001).Conclusions: Results suggest that environmental Mn exposure may have adverse consequences on mood disturbance and quality of life. Disclaimer: This abstract does not necessarily reflect EPA policy.