Are there any shortcomings of the Kurtzke Disability Status Scale (DSS)?

Kurtzke Disability Status Scale (DSS) clearly has its shortcomings. First, some read it to suggest a typical progression of the disease from number 1 to 2, then 2 to 3, and so on to death. Also, there are many exceptions to the scale.

For example, many people who require a cane for walking may be active and working and only have a mild disability, yet their 6 DSS rating doesn't accurately reflect this.

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