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Development of the Japanese Core Outcome Measures Index (COMI): cross-cultural adaptation and psychometric validation.

Abstract：

BACKGROUND:The patient-rated Core Outcome Measures Index (COMI) assesses the multidimensional impact of back problems on the sufferer. The brevity and comprehensibility of the tool make it practical for use in clinical and research settings. Although the COMI has been cross-culturally adapted in various languages worldwide, there is currently no Japanese version. The aim of this study was to develop a Japanese version of the COMI by: (1) performing a cross-cultural adaptation of the English version and (2) evaluating the psychometric properties of the Japanese version of the COMI in Japanese volunteers with chronic back problems. METHODS:The English version of the COMI was cross-culturally adapted for the Japanese language using established guidelines. The pre-final version was pilot-tested in five Japanese-speaking patients with low back pain (LBP) and a history of spine surgery. The psychometric properties of the Japanese COMI were tested in a group of 1052 individuals with chronic LBP (LBP ≥3 months), aged 20-69 years, who were recruited through a web-based survey. The psychometric properties that were evaluated included convergent and known-group validity, using the following reference questionnaires: EuroQol 5 Dimension, Roland Morris Disability Questionnaire, Short Form 8™ Health Survey, and the Keele STarT Back Screening Tool. RESULTS:The pre-final version of the cross-culturally adapted Japanese COMI was completed without any major problems of understanding or acceptability. For the evaluation of its psychometric properties, tests for convergent validity showed moderate correlations between COMI items and the respective reference questionnaires for symptom-specific well-being [- 0.33--0.48] and disability domains [0.48] and strong correlations (> 0.5) for the other domains and the COMI summary score. The analysis of known-group validity showed a linear trend for the COMI score in relation to prognostic risk (P < 0.001). CONCLUSIONS:The Japanese COMI retained conceptual equivalence to the original using comprehensible and acceptable Japanese expressions. We developed a Japanese version of the COMI that displayed qualities that support its convergent and known-group validity. The availability of a Japanese version of the COMI should allow for improved documentation of the care provided to patients with back problems.

journal_name

BMC Musculoskelet Disord

journal_title

BMC musculoskeletal disorders

authors

Matsudaira K,Oka H,Oshima Y,Chikuda H,Taniguchi Y,Matsubayashi Y,Kawaguchi M,Sato E,Murano H,Laurent T,Tanaka S,Mannion AF

doi

10.1186/s12891-018-1986-x

subject

Has Abstract

pub_date

2018-03-02 00:00:00

pages

issue

issn

1471-2474

pii

10.1186/s12891-018-1986-x

journal_volume

pub_type

杂志文章

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Development of the Japanese Core Outcome Measures Index (COMI): cross-cultural adaptation and psychometric validation.