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We are well aware of the relationship between age and scores on the Category Test, and we refer Dr Binder to our discussion of this in the "Results" section of the report. If we had relied on a mean Category Test score alone in making statements about our subject population, Dr Binder's point would carry even more weight; however, the data were examined in terms of the number of normal vs impaired subjects. To do this, a judgment of "impaired" or "unimpaired" was made for each subject using the outlined criteria rather than the standard cut-off score. This is exactly the determination that clinicians must make daily, for any given patient. For example, there can be little disagreement that a 54-year-old subject with 12 years of education and an estimated IQ of 94 who makes 104 errors on the Category Test is impaired beyond anything attributable to normal aging.We
Edwards KR, Poser CM, Filskov SB, Peyser JM. Control Groups for Multiple Sclerosis Tests-Reply. Arch Neurol. 1981;38(5):325. doi:10.1001/archneur.1981.00510050091024
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