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© 2019. This work is licensed under https://creativecommons.org/licenses/by-nc/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Purpose: The brief negative symptoms scale (BNSS) is a concise instrument used to assess negative symptoms of subjects with schizophrenia covering five domains of negative symptoms and is suitable for use in clinical, experimental, and epidemiological settings. The original and translated version of BNSS has thus far been shown to have adequate psychometric properties. This study aimed to examine internal consistency, inter-rater and test-retest reliability, discriminant and convergent validity, and factor structure of the Japanese version of BNSS.

Patients and methods: The assessment was performed by 11 raters using interview videos of nine subjects. Reliability was calculated with Cronbach’s alpha for internal consistency and intra class correlation coefficient (ICC) for inter-rater reliability. Pearson’s correlation coefficients were calculated to estimate the test-retest reliability. In addition to BNSS, Scale for assessment of negative symptoms (SANS) and scale for assessment of positive symptoms (SAPS) was obtained to assess the convergent and discriminant validity. Factor structure was assessed using principle factor analysis.

Results: The Japanese BNSS showed excellent internal consistency (Cronbach’s alpha=0.95), inter-rater reliability (intra class correlation coefficient=0.97), and test-retest reliability (r=0.94, p<0.001). The convergent validity shown by correlation with SANS total score (r=0.87, p<0.001) and discriminant validity shown by correlation with SAPS total score (r=0.17, p=−0.68) were also good. Principal factor analysis revealed a two-factor structure of BNSS, although the loading of each item differed from that in the literature.

Conclusion: Our pilot study demonstrated that Japanese BNSS had good psychometric properties which were achieved with relatively brief training. Further studies with more subjects and raters with various backgrounds recruited from multiple sites are warranted.

Details

Title
Pilot Validation Study of the Japanese Translation of the Brief Negative Symptoms Scale (BNSS)
Author
Hashimoto, Naoki; Toyomaki, Atsuhito; Oka, Matsuhiko; Takanobu, Keisuke; Okubo, Ryo; Narita, Hisashi; Kitagawa, Kan; Niki Udo; Maeda, Tamaki; Watanabe, Shinya; Oyanagi, Yuka; Miyazaki, Akane; Ito, Koki; Kusumi, Ichiro
Pages
3511-3518
Section
Original Research
Publication year
2019
Publication date
2019
Publisher
Taylor & Francis Ltd.
ISSN
1176-6328
e-ISSN
1178-2021
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2446028419
Copyright
© 2019. This work is licensed under https://creativecommons.org/licenses/by-nc/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.