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Risk of multiple sclerosis in relation to industrial activities: an ecological study in four European countries.

The pattern of industries, in terms of workers in any individual industry in relation to total population, was compared with multiple sclerosis (MS) risk, as reported in previous communications in Norway, Denmark, Sweden and Switzerland. A great number of correlations with MS was found but, when intercorrelations were considered, paper manufacturing appeared to be the most closely associated with MS. The possible relevance of these findings in view of the methodological limitations is discussed.