• Yoshitaka Matsubayashi, Katsushi Takeshita, Masahiko Sumitani, Yasushi Oshima, Juichi Tonosu, So Kato, Junichi Ohya, Takeshi Oichi, Naoki Okamoto, and Sakae Tanaka.
• Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Tokyo, Japan.
• Plos One. 2015 Jan 1; 10 (11): e0143350.

ObjectiveThis study aimed to evaluate the validity and reliability of the Japanese version of the Neuropathic Pain Symptom Inventory (NPSI-J).DesignCross-sectional study design.Subjects And MethodsThe original Neuropathic Pain Symptom Inventory (NPSI) was translated into Japanese according to published guidelines. Subsequently, an observational study of 60 Japanese patients suffering from neuropathic pain was performed to evaluate the validity and reliability of the NPSI-J.ResultsThe NPSI-J exhibited a statistically significant correlation with pain intensity (Numerical Rating Scale). The Cronbach alpha value for Likert items was 0.86. Using the test-retest analysis method, the intraclass correlation coefficient between the two scores was 0.81. Factor analysis revealed that the main component of NPSI-J comprised three determinative factors.ConclusionsThe NPSI-J is a reliable and valid pain assessment tool.

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