alexa Use of SF-36 and SF-12 health status measures: a quantitative comparison for groups versus individual patients.
Infectious Diseases

Infectious Diseases

Air & Water Borne Diseases

Author(s): Riddle DL, Lee KT, Stratford PW

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Abstract BACKGROUND: The extent to which SF-12 scores reflect SF-36 scores has not been well studied. OBJECTIVES: One purpose was to compare the sensitivity to change of the SF-36 Physical Function sub-score, and the Physical Component Summary Scores (PCS) of the SF-36 and SF-12 on patients with low back pain (LBP). A second purpose was to determine if the SF-12 could serve as a surrogate measure for the SF-36 when making decisions about individual patients. SUBJECTS: The sample consisted of 101 consecutive patients. MEASURES: SF-36 questionnaires were completed by patients at both initial and discharge examinations. SF-12 scores were calculated from the completed SF-36 questionnaires. Therapists' judgments of whether patients were judged to have returned to premorbid function served as the construct for meaningful clinical change. ANALYSIS: Receiver Operating Characteristic (ROC) curve analysis and repeated measures MANCOVA were used to assess sensitivity to change. Linear regression and 95\% prediction bands described the extent to which SF-12 scores predict individual SF-36 scores. RESULTS: No significant differences were found between the ROC curve areas for the Physical Function sub-scale, the PCS-36 and PCS-12. No significant differences were found for the comparison of change scores between PF-36, PCS-36 and PCS-12 scores. CONCLUSION: The findings suggest that Physical Function sub-scores, SF-36 and SF-12 PCS scores are equally sensitive to change. SF-12 PCS scores do not adequately predict SF-36 PCS scores for individual patients. The PCS-12 should probably not be used to make judgments about the health status of individual patients with LBP.
This article was published in Med Care and referenced in Air & Water Borne Diseases

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