METHOD: This study is a longitudinal evaluation of outcome measures. Thirty-one private chiropractic practices in Denmark participated in this study. The outcome measures chosen for this study are the serial measurements using the Roland-Morris Disability Questionnaire, the patient's prospective global assessment on a visual analog scale, and the patient's retrospective global assessment of improvement on a visual analog scale.
RESULTS: The 3 outcome measures differed significantly in their ability to register clinical improvement, with the retrospective global assessment of improvement being the most responsive.
CONCLUSION: More research is needed in this area, and caution must be taken in choosing outcome measures for randomized clinical trials on low back pain.
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