The Brief Negative Symptom Scale: Validation in a multicenter Brazilian study.

Autor: de Medeiros HLV; Federal University of Paraíba, Jardim Universitário STr, João Pessoa, PB, Brazil. Electronic address: hvirgulino@gmail.com., Vasconcelos SC; Federal University of Paraíba, Jardim Universitário STr, João Pessoa, PB, Brazil., Elkis H; University of São Paulo, 785, Ovídio Pires de Campos ST, São Paulo, SP, Brazil., Martins DR; Federal University of Paraíba, Jardim Universitário STr, João Pessoa, PB, Brazil., de Alexandria Leite RM; University of Pernambuco, 310, Arnobio Marques ST, Recife, PE, Brazil., de Albuquerque ACL; University of Pernambuco, 310, Arnobio Marques ST, Recife, PE, Brazil., Freitas RR; University of São Paulo, 785, Ovídio Pires de Campos ST, São Paulo, SP, Brazil., Scardoelli MA; University of São Paulo, 785, Ovídio Pires de Campos ST, São Paulo, SP, Brazil., Di Sarno E; University of São Paulo, 785, Ovídio Pires de Campos ST, São Paulo, SP, Brazil., Napolitano I; University of São Paulo, 785, Ovídio Pires de Campos ST, São Paulo, SP, Brazil., Oliveira GM; University of São Paulo, 785, Ovídio Pires de Campos ST, São Paulo, SP, Brazil., Vizzotto A; University of São Paulo, 785, Ovídio Pires de Campos ST, São Paulo, SP, Brazil., da Silva AMP; University of Pernambuco, 310, Arnobio Marques ST, Recife, PE, Brazil., da Costa Lima MD; Federal University of Pernambuco, Engenharia AVE, Recife, PE, Brazil.
Jazyk: angličtina
Zdroj: Comprehensive psychiatry [Compr Psychiatry] 2018 Aug; Vol. 85, pp. 42-47. Date of Electronic Publication: 2018 Jun 21.
DOI: 10.1016/j.comppsych.2018.06.007
Abstrakt: Background: Negative symptoms are a core feature of schizophrenia. The Brief Negative Symptom Scale (BNSS) is a scale developed to measure negative symptoms in schizophrenia.
Methods: The present study aimed to examine the construct validity of BNSS, by using convergent and divergent validities as well as factor analysis, in a Brazilian sample of 111 outpatients diagnosed with schizophrenia by DSM-5. Patients were evaluated by the Brazilian version of the BNSS and positive and negative subscales of the Positive and Negative Syndrome Scale (PANSS).
Results: Assessment of patients by both instruments revealed an excellent internal consistency (Cronbach's alpha = 0.938) or inter-rater reliability (ICC = 0.92), as well as a strong correlation between BNSS and Marder negative PANSS (r = 0.866) and a weak correlation of the instrument with the positive PANSS (r = 0.292), thus characterizing convergent and discriminant validities, respectively. The exploratory factor analysis identified two distinct factors, namely, motivation/pleasure and emotional expressivity, accounting for 68.63% of the total variance.
Conclusion: The study shows that the Brazilian version of the BNSS has adequate psychometric properties and is a reliable instrument for the assessment of negative symptoms in schizophrenia, either for clinical practice or research.
(Copyright © 2018 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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