The Brief Negative Symptom Scale (BNSS): Independent validation in a large sample of Italian patients with schizophrenia - 13/06/15
on behalf of the
Italian Network for Research on Psychoses1
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Abstract |
Background |
The Brief Negative Symptom Scale (BNSS) was developed to address the main limitations of the existing scales for the assessment of negative symptoms of schizophrenia. The initial validation of the scale by the group involved in its development demonstrated good convergent and discriminant validity, and a factor structure confirming the two domains of negative symptoms (reduced emotional/verbal expression and anhedonia/asociality/avolition). However, only relatively small samples of patients with schizophrenia were investigated. Further independent validation in large clinical samples might be instrumental to the broad diffusion of the scale in clinical research.
Methods |
The present study aimed to examine the BNSS inter-rater reliability, convergent/discriminant validity and factor structure in a large Italian sample of outpatients with schizophrenia.
Results |
Our results confirmed the excellent inter-rater reliability of the BNSS (the intraclass correlation coefficient ranged from 0.81 to 0.98 for individual items and was 0.98 for the total score). The convergent validity measures had r values from 0.62 to 0.77, while the divergent validity measures had r values from 0.20 to 0.28 in the main sample (n=912) and in a subsample without clinically significant levels of depression and extrapyramidal symptoms (n=496). The BNSS factor structure was supported in both groups.
Conclusions |
The study confirms that the BNSS is a promising measure for quantifying negative symptoms of schizophrenia in large multicenter clinical studies.
Le texte complet de cet article est disponible en PDF.Keywords : Schizophrenia, Negative symptoms, Primary negative symptoms, Poor emotion expression, Avolition
Plan
Vol 30 - N° 5
P. 641-647 - juillet 2015 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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