Table 4.

Relative risk (RR) with 95% confidence interval (CI) of amyotrophic lateral sclerosis according to long-term consumption of drinking water with Se content ≥1 μg/l vs. <1 μg/l in conditional logistic regression models, Reggio Emilia municipality, northern Italy, 1995-2006

Model	RR	95% CI
Bivariate model	4.2	1.1 - 16
Multivariate model - 1a	4.3	1.1 - 17
Multivariate model - 2b	5.4	1.3 - 24
Multivariate model - 3c	5.4	1.1 - 26

^aAdjusting for educational attainment level

^bAdjusting for occupational pesticide exposure

^cAdjusting for all potential confounders (educational attainment level and exposure to pesticides, industrial chemicals and electromagnetic fields)