Table 4.
Grouped occupational exposures and amyotrophic lateral sclerosis risk
| Cases (N= 2647) | Controls (N= 13378) | Adjusteda
|
||
|---|---|---|---|---|
| No. | No. | OR | 95% CI | |
| No exposure | 1787 | 9104 | Reference | |
| Metals + benzo (a) pyreneb | 651 | 3243 | 1.07 | 0.91–1.26 |
| Solventsc | 489 | 2496 | 0.92 | 0.77–1.09 |
| Formaldehyde | 323 | 1579 | 1.07 | 0.93–1.23 |
a
Adjusted for age and gender (matching factors) and education. The three occupational exposure groups were mutually adjusted for one another.
b
Includes lead, iron, nickel, chromium, benzo (a) pyrene
c
Includes toluene, benzene, trichloroethylene, methylene chloride, perchloroethylene, 1,1,1-trichloroethane