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Table 5 Relative risk (RR) with 95% confidence interval (CI) of amyotrophic lateral sclerosis, according to overall lifetime estimated intakea of inorganic Se through drinking water, Reggio Emilia municipality, northern Italy, 1995-2006

From: The relation between amyotrophic lateral sclerosis and inorganic selenium in drinking water: a population-based case-control study

Lifetime Se intake (μg) Cases/controls RR 95% CI
0 27/68 1.0 (referent) -
1-9999 6/7 2.1 0.5-9.1
≥10000 8/7 6.4 1.3-31
  1. aEstimated on the basis of drinking water consumption during the 35-year period before diagnosis in patients and the corresponding period for matched referents.