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European Spine Journal
Published in: European Spine Journal 12/2015

01-12-2015 | Original Article

Reliability, validity, and responsiveness of the Japanese version of the Patient-Specific Functional Scale in patients with neck pain

Authors: Koji Nakamaru, Junya Aizawa, Takayuki Koyama, Osamu Nitta

Published in: European Spine Journal | Issue 12/2015

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Abstract

Purpose

The aims of this study were to translate and culturally adapt the Patient-Specific Functional Scale (PSFS) and validate the Japanese version of the PSFS (PSFS-J) in outpatients with neck pain.

Methods

The PSFS was translated and adapted into Japanese in accordance with the published guidelines. A total of 103 outpatients with neck pain were recruited for this study. Psychometric evaluation included test–retest reliability, convergent validity by comparing the PSFS-J to the Neck Disability Index (NDI), patient’s global impression of change (PGIC), and responsiveness (unpaired t test, minimal detectable change).

Results

The intraclass correlation coefficient for test–retest reliability was 0.98 (95 % confidence interval = 0.95–0.99). The Pearson correlation coefficient with the NDI was −0.35. The Spearman correlation coefficient showed a strong relationship between the change score in the PSFS-J and PGIC (−0.70). The analysis of responsiveness was calculated with the unpaired t test showing a significant difference between the stable and improved patients (P < 0.01). The minimal detectable change was calculated as 0.64.

Conclusions

The Japanese version of the PSFS is a valid, reliable, and responsive instrument to assess Japanese outpatients with neck pain.
Appendix
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Metadata
Title
Reliability, validity, and responsiveness of the Japanese version of the Patient-Specific Functional Scale in patients with neck pain
Authors
Koji Nakamaru
Junya Aizawa
Takayuki Koyama
Osamu Nitta
Publication date
01-12-2015
Publisher
Springer Berlin Heidelberg
Published in
European Spine Journal / Issue 12/2015
Print ISSN: 0940-6719
Electronic ISSN: 1432-0932
DOI
https://doi.org/10.1007/s00586-015-4236-z

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