What mental illnesses cause different performance on the Wisconsin Card Sorting Task I am aware that the Wisconsin Card Sorting Task (WCST) has been used multiple times to demonstrate differences in executive function control in schizophrenics, but what other mental illness sufferers have been demonstrated to have significant performance differences on the WCST?
The diseases and mental dysfunctions that have been studied are Parkinson's disease, Huntington's disease, ADHD, Substance Dependence, Autism, Multiple Sclerosis and Schizophrenia (with and without tardive dyskenisia). I'll add more specific statistics (such as trials required to acquire first rule) and better references later.

In the meantime, during my search I found this really quick table:
 from this paper showing the amount of completed categories and preservative errors (when a person is ignoring that the rule has changed).