Summary of demographic and clinical data at baseline and retest (mean ± SD).

<p>DOI, duration of illness; PANSS, Positive and Negative Syndrome Scale;</p><p>CPZ, chlorpromazine.</p><p>^aχ² test;</p>b<p><i>t</i>-test for independent samples,</p>c<p><i>t</i>-test for paired samples.