Estimated relative risk of Alzheimer's disease associated with residence in areas having a concentration of aluminum in municipal drinking water of 0.1 mg/l or more. Based on subsets of the Ontario data classified by age and sex
| Age group | Number of case/control pairs | Estimated relative risk: men | Estimated relative risk: women |
| <70 | 325 | 1.06 | 1.05 |
| 70–74 | 381 | 1.05 | 1.22 |
| 75–79 | 507 | 1.60 | 1.29 |
| 80–84 | 547 | 1.29 | 1.47 |
| >85 | 498 | 1.24 | 1.46 |