Table 2: WCST parameters in schizophrenic and psychotic depression patients (significance level set at 𝑃 < 0 . 0 5 ).

WCST parameterPatients with schizophrenia ( 𝑛 = 3 0 )Patients with major depression with psychotic features ( 𝑛 = 3 0 )Statistic 𝑈 bitailed

Number of trials 1 1 8 . 4 ± 1 9 . 7 1 2 8 ± 0 2.67 ( 𝑃 > 0 . 0 5 )
% of Errors 4 7 . 2 % ± 1 0 . 7 9 3 4 % ± 1 5 . 2 1.04 ( 𝑃 > 0 . 0 5 )
% of perseverative errors 3 0 % ± 1 1 . 4 1 8 % ± 9 . 9 7 0.01* ( 𝑃 < 0 . 0 3 )
Number of completed categories 3 ± 1 . 3 3 . 8 ± 1 . 6 4 2.09 ( 𝑃 > 0 . 0 5 )
Number of trials to the 1st completed category 1 8 . 2 ± 1 2 . 0 8 1 4 . 4 ± 5 . 0 9 1.5 ( 𝑃 > 0 . 0 5 )

* 𝑃 < 0 . 0 5 .
Note. Better performance on WCST is indicated by larger number of trials but less percentage of errors, number of completed categories, and number of trials to the 1st completed category.