requires at least 1 of the following symptoms for a significant portion of the time during a 1-month period: delusions, hallucinations or disorganized speech. Grossly disorganized behavior (catatonia) or the negative symptoms described above may also be present. Symptoms may have been present for less than a month, if they resolved after being treated. Symptoms must last more than a month but less than 6 months. There can be no manic, depressive or mixed manic-depressive episodes during these symptoms, and any mood disturbance must have been present during only a minority of this time, thereby excluding schizoaffective disorder or bipolar disorder with psychotic features. These symptoms cannot be due to the effects of a substance (drug of abuse or medication), or to a medical or neurological disorder.
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