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Associations between the injustice experience questionnaire and treatment term in patients with acute Whiplash-associated disorder in Japan: Comparison with Canadian data

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  • Kazuhiro Hayashi
  • Kenji Miki
  • Tatsunori Ikemoto
  • Takahiro Ushida
  • Masahiko Shibata

Abstract

Introduction: This study aimed to investigate the differences in the Injustice Experience Questionnaire (IEQ) scores during the early period after the diagnosis of Whiplash-associated disorder (WAD) between Japanese and Canadian samples, and the associations between the IEQ scores and treatment terms in Japanese patients with acute WAD. Methods: We used secondary data for the IEQ scores of Canadian patients with acute WAD. In Japan, we collected data from 85 consecutively enrolled patients with acute WAD, and their treatment terms were collected; these referred to the number of days between the date of injury and the closure date of the insurance claim and the number of treatment visits. Before treatment, the Numeric Rating Scale, Neck Disability Index, Hospital Anxiety and Depression Scale, IEQ, and Euro Quality of Life five-dimensional questionnaire were administered. The variables were subjected to multivariate analysis with each treatment term. Results: The IEQ scores were higher in Japan than in Canada. Through multiple regression analysis, IEQ scores were independently correlated with treatment terms. The optimal cutoff point of the IEQ scores for a prolonged treatment term was 21 and 22 points, respectively. Conclusions: The IEQ scores were associated with treatment terms in patients with acute WAD in Japan.

Suggested Citation

  • Kazuhiro Hayashi & Kenji Miki & Tatsunori Ikemoto & Takahiro Ushida & Masahiko Shibata, 2020. "Associations between the injustice experience questionnaire and treatment term in patients with acute Whiplash-associated disorder in Japan: Comparison with Canadian data," PLOS ONE, Public Library of Science, vol. 15(4), pages 1-14, April.
    • Handle: RePEc:plo:pone00:0231077
    DOI: 10.1371/journal.pone.0231077
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    References listed on IDEAS

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    1. Keiko Yamada & Tomonori Adachi & Akira Mibu & Tomohiko Nishigami & Yasushi Motoyama & Hironobu Uematsu & Yoichi Matsuda & Hitoaki Sato & Kenichi Hayashi & Renzhe Cui & Yumiko Takao & Masahiko Shibata , 2016. "Injustice Experience Questionnaire, Japanese Version: Cross-Cultural Factor-Structure Comparison and Demographics Associated with Perceived Injustice," PLOS ONE, Public Library of Science, vol. 11(8), pages 1-16, August.
    2. Taweewat Wiangkham & Joan Duda & Sayeed Haque & Mohammad Madi & Alison Rushton, 2015. "The Effectiveness of Conservative Management for Acute Whiplash Associated Disorder (WAD) II: A Systematic Review and Meta-Analysis of Randomised Controlled Trials," PLOS ONE, Public Library of Science, vol. 10(7), pages 1-22, July.
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