Table 1 Characteristics of cases and controls, population-based case-control study on ALS, Reggio Emilia, northern Italy, 1995-2006
Characteristics | Cases n (%) | Controls n (%) |
|---|---|---|
Sex | Â | Â |
   Male | 30 (73) | 60 (73) |
   Female | 11 (27) | 22 (27) |
Age | Â | Â |
   40-54 | 9 (22) | 18 (22) |
   55-69 | 13 (32) | 26 (32) |
   ≥70 | 19 (46) | 38 (46) |
Educational level | Â | Â |
   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 | Â | Â |
   Pesticides | 13 (32) | 11 (13) |
   Chemicals | 13 (32) | 26 (32) |
   Electromagnetic fields | 1 (2) | 0 (0) |