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

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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.

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Authors and Affiliations

  1. Department of Rehabilitation Medicine, Terashima Orthopaedic Clinic, 3-33-10 Nishiooizumi Nerima-ku, Tokyo, 178-0065, Japan

    Koji Nakamaru

  2. Graduate School of Human Health Science, Tokyo Metropolitan University, Tokyo, Japan

    Koji Nakamaru & Osamu Nitta

  3. Athletic Rehabilitation Section, Clinical Center for Sports Medicine and Sports Dentistry Sports Science Organization, Tokyo Medical and Dental University, Tokyo, Japan

    Junya Aizawa

  4. Department of Physical Education, Nihon University, Tokyo, Japan

    Takayuki Koyama

Authors
  1. Koji Nakamaru
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  2. Junya Aizawa
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  3. Takayuki Koyama
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  4. Osamu Nitta
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Corresponding author

Correspondence to Koji Nakamaru.

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Conflict of interest

None.

IRB approval statement

The study was approved by the Ethical Review Board at Tokyo Metropolitan University.

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Nakamaru, K., Aizawa, J., Koyama, T. et al. Reliability, validity, and responsiveness of the Japanese version of the Patient-Specific Functional Scale in patients with neck pain. Eur Spine J 24, 2816–2820 (2015). https://doi.org/10.1007/s00586-015-4236-z

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  • DOI: https://doi.org/10.1007/s00586-015-4236-z

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