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Pilot Validation Study of the Japanese Translation of the Brief Negative Symptoms Scale (BNSS)

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Title: Pilot Validation Study of the Japanese Translation of the Brief Negative Symptoms Scale (BNSS)
Authors: Hashimoto, Naoki Browse this author
Toyomaki, Atuhito Browse this author
Oka, Matsuhiko Browse this author
Takanobu, Keisuke Browse this author
Okubo, Ryo Browse this author →KAKEN DB
Narita, Hisashi Browse this author →KAKEN DB
Kitagawa, Kan Browse this author
Udo, Niki Browse this author
Maeda, Tamaki Browse this author
Watanabe, Shinya Browse this author
Oyanagi, Yuka Browse this author
Miyazaki, Akane Browse this author
Ito, Koki Browse this author →KAKEN DB
Kusumi, Ichiro Browse this author →KAKEN DB
Keywords: negative symptom
factor structure
Issue Date: 23-Dec-2019
Publisher: Dove Medical Press
Journal Title: Neuropsychiatric Disease and Treatment
Volume: 15
Start Page: 3511
End Page: 3518
Publisher DOI: 10.2147/NDT.S237449
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.
Type: article
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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