Academic journal article Indian Journal of Psychiatry

Wisconsin Card Sorting Test Performance Impairment in Schizophrenia: Flaws in a Report

Academic journal article Indian Journal of Psychiatry

Wisconsin Card Sorting Test Performance Impairment in Schizophrenia: Flaws in a Report

Article excerpt

Byline: Pravesh. Parekh, Avinash. Shukla, Migita. Dcruz, Satish. Suhas, Chittaranjan. Andrade

Sir,

Singh et al .[1] administered the Wisconsin Card Sorting Test (WCST) to patients with positive and negative symptom schizophrenia, classified based on their composite Positive and Negative Syndrome Scale score. They reported distinct WCST measure deficits in positive and negative schizophrenia patients. However, there are reasons to reconsider the conclusions that the authors have drawn from their study.

Assuming that the authors recruited 50 consecutive patients (as they should have if they followed good sampling procedures), the data that the authors presented in [Table 1] in their paper look too good to be true. There were exactly 25 patients in each group, and the groups were almost perfectly matched on not one but three continuous variables, all of which showed a distinct leptokurtic distribution. Furthermore, the age at illness onset plus duration of illness should yield present age, and this was not so in the data shown in [Table 1], again strongly suggesting that the data are suspect.{Table 1}

In addition, in [Table 1], for example, the F values for the age of onset and duration of illness are both wrong. …

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