Spine · 2002
The reliability of the Low Back Outcome Score for back pain.
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Holt Anne E, Shaw Nick J, Shetty Ajit, Greenough Charles G
Аннотация
STUDY DESIGN: A prospective test-retest study was conducted to investigate both new and follow-up patients with low back pain presenting to an orthopedic surgeon specializing in back pain.
OBJECTIVES: To further validate the internal consistency and test-retest reliability of the Low Back Outcome Score, and to compare these results with other condition-specific disability scales.
SUMMARY OF BACKGROUND DATA: To be useful in clinical practice, health-specific questionnaires must demonstrate reliability and validity. Several disease-specific questionnaires for low back pain have been validated to different extents.
METHODS: In this study, 102 new and 42 follow-up patients consecutively attending a consultant clinic completed the Low Back Outcome Score on their visit, then again after an interval of 1 week in postal form. This instrument also was completed by 230 patients presenting to a physiotherapist.
RESULTS: A response rate of 90% was achieved for the postal questionnaire. A test of internal consistency conducted with the study sample achieved a Cronbach alpha coefficient of 0.85. Overall agreement for test-retest reliability was 84%, and the reliability coefficient (K) reached a range of 0.51 to 0.86 (P < 0.05). A Bland/Altman plot was calculated, demonstrating that only 5% of patient scores change by more than 11.6 scale points between test and retest, which is not sufficient to change outcome categories.
CONCLUSION: The Low Back Outcome Score appears to have good internal consistency and test-retest reliability for use in clinical practice.
OBJECTIVES: To further validate the internal consistency and test-retest reliability of the Low Back Outcome Score, and to compare these results with other condition-specific disability scales.
SUMMARY OF BACKGROUND DATA: To be useful in clinical practice, health-specific questionnaires must demonstrate reliability and validity. Several disease-specific questionnaires for low back pain have been validated to different extents.
METHODS: In this study, 102 new and 42 follow-up patients consecutively attending a consultant clinic completed the Low Back Outcome Score on their visit, then again after an interval of 1 week in postal form. This instrument also was completed by 230 patients presenting to a physiotherapist.
RESULTS: A response rate of 90% was achieved for the postal questionnaire. A test of internal consistency conducted with the study sample achieved a Cronbach alpha coefficient of 0.85. Overall agreement for test-retest reliability was 84%, and the reliability coefficient (K) reached a range of 0.51 to 0.86 (P < 0.05). A Bland/Altman plot was calculated, demonstrating that only 5% of patient scores change by more than 11.6 scale points between test and retest, which is not sufficient to change outcome categories.
CONCLUSION: The Low Back Outcome Score appears to have good internal consistency and test-retest reliability for use in clinical practice.