![]() The BNSS had excellent internal consistency in SZ, BD, and CN groups. BD patients with a history of psychosis did not differ from those without a history of psychosis on negative symptom severity. Results indicated differences among the 3 groups in the severity of all BNSS items, with SZ and BD scoring higher than CN however, SZ and BD only differed on blunted affect and alogia items, not anhedonia, avolition, or asociality. Participants completed neuropsychological testing and a clinical interview designed to assess negative, positive, disorganized, mood, and general psychiatric symptoms. ![]() In the current study, we extended this literature by examining psychometric properties of the BNSS in outpatients diagnosed with bipolar disorder (n=46), outpatients with schizophrenia (n=50), and healthy controls (n=27). Past studies have demonstrated that the Brief Negative Symptom Scale (BNSS) has excellent psychometric properties in patients with schizophrenia.
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