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Table 1 Characteristics of cases and controls, population-based case-control study on ALS, Reggio Emilia, northern Italy, 1995-2006

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

Characteristics Cases n (%) Controls n (%)
Sex   
   Male 30 (73) 60 (73)
   Female 11 (27) 22 (27)
Age   
   40-54 9 (22) 18 (22)
   55-69 13 (32) 26 (32)
   ≥70 19 (46) 38 (46)
Educational level   
   Elementary or lower 20 (49) 38 (46)
   Middle school 7 (17) 26 (32)
   High school 10 (24) 15 (18)
   University 4 (10) 3 (4)
Occupational exposure   
   Pesticides 13 (32) 11 (13)
   Chemicals 13 (32) 26 (32)
   Electromagnetic fields 1 (2) 0 (0)