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Chiropractic Research Review

Assessing the ODQ

The Oswestry Low Back Pain Disability Questionnaire (ODQ) is a widely used 10-item paper-and-pencil measure of disability resulting from low back pain. However, few studies have assessed its ability to measure patients' evaluation of their back pain.

This study evaluated the response set bias, the internal consistency and the construct validity of the ODQ.

Seven modified versions of the ODQ were developed, each differing in a single respect from the original and compared with it. One of the eight versions was randomly allocated to each of 102 adult patients presenting with low back pain.

Results suggest that the responses given to the eight versions of the ODQ are a function of content and not of the format in which the items are presented.

Conclusions: The ODQ is designed specifically for patients with back pain. It does not contain a response set bias. As such, alternate versions may be used on subsequent disability assessments. Psychometric evaluation of the ODQ has shown it to be an instrument with high internal consistency. Its scores are strongly correlated to Roland Morris Functional Disability Scale scores.

Tibbles AC, Waalen JK, Hains F. Response set bias, internal consistency and construct validity of the Oswestry low back pain disability questionnaire. Journal of the Canadian Chiropractic Association, Sept. 1998; 42(3), pp141-49. Reprints: Tel: (416) 781-5656; Fax: (416) 781-7344

Chiropractic Research Review

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