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Table III. Matched Analyses, male ALS cases and controls: occupational heavy metal exposures, Pb and Hg.
Variable Exposure OR CI
+ + + - - + - -
All metal occupations >1 6 13 6 8 2.20 0.69, 7.47
Pb occupations >1 5 12 6 10 2.00 0.63, 7.00
Hg occupations >1 2 6 4 21 1.50 0.31, 8.26
+ + = Both case and control exposed; + - = Case exposed, control not exposed; - + = Case not exposed, control exposed; - - = Both case and control not exposed. OR = Odds ratio; CI = Confidence interval.