Risk for neuropathologically confirmed Alzheimer's disease and residual aluminum in municipal drinking water employing weighted residential histories

Neurology
D R McLachlanS L Rifat

Abstract

We investigated a possible relation between aluminum concentration ([Al]) in public drinking water and Alzheimer's disease (AD), with AD cases and controls defined on the basis of strict neuropathologic criteria. Using the case/control odds ratio as an estimate of relative risk and [Al] > or = 100 microgram/L as the cutoff point, elevated risks for histopathologically verified AD were associated with higher [Al]. Comparing all AD cases with all non-AD controls, and using the [Al] of public drinking water at last residence before death as the measure of exposure, the estimated relative risk associated with [Al] > or = 100 microgram/L was 1.7 (95% CI: 1.2-2.5). Estimating aluminum exposure from a 10-year weighted residential history resulted in estimates of relative risk of 2.5 or greater. The public health implications of the observed relationship between [Al] in drinking water and AD prevalence in the population depend in large measure on population exposure characteristics. In Ontario, it is estimated that 19% of the population was exposed to residual [Al] greater than or equal to 100 microgram/L. Based on the estimated relative risk and the assumption of causality, this translates to an etiologic fraction of 0.23. Although th...Continue Reading

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