Table 4.
Risk of amyotrophic lateral sclerosis according to particulate matter (PM10) exposure using tertile distribution.
| Exposure Categories | Median Value (µg/m3) | Cases/ Controls |
OR a | (95% CI) | OR b | (95% CI) |
|---|---|---|---|---|---|---|
| Annual median PM10 levels | ||||||
| T1 < 3.0 µg/m3 | 1.4 | 19/26 | 1.00 | - | 1.00 | - |
| T2 ≥ 3.0–<6.6 µg/m3 | 4.2 | 17/27 | 0.86 | (0.37–2.01) | 0.66 | (0.28–1.68) |
| T3 ≥ 6.6 µg/m3 | 8.4 | 16/27 | 0.81 | (0.34–1.91) | 0.73 | (0.30–1.79) |
| Annual maximum PM10 levels |
||||||
| T1 < 30.0 µg/m3 | 20.5 | 22/26 | 1.00 | - | 1.00 | - |
| T2 ≥ 30.0–<50.4 µg/m3 | 38.3 | 16/27 | 0.70 | (0.30–1.62) | 0.73 | (0.30–1.74) |
| T3 ≥ 50.4 µg/m3 | 59.5 | 14/27 | 0.61 | (0.26–1.45) | 0.65 | (0.26–1.58) |
a: Crude model; b: Model adjusted for sex and age. OR: odds ratio; CI: confidence interval.