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Article
January 1988

Modification of Parkinson's Disease by Long-term Levodopa Treatment

Author Affiliations

Department of Neurology University Hospital Dijkzigt 40 Dr Molewaterplein 3015 GD Rotterdam, the Netherlands

Arch Neurol. 1988;45(1):14. doi:10.1001/archneur.1988.00520250016003
Abstract

To the Editor.  —Markham and Diamond1 drew attention to the controversy concerning the early start or postponement of levodopa therapy in Parkinson's disease. We should like to point to an inaccuracy in their article. They use two disability scores (Hoehn and Yahr and UCLA scores), but because these are so-called ordinal scales, average values cannot be calculated. As Wulff2 said: "To measure on an ordinal scale is like using an unevenly stretched tape measure."In our opinion, figures like the one shown in their article cannot be made for either the UCLA or the Hoehn and Yahr scale, and, as a consequence, their figure has no meaning.

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