Abstract:
OBJECTIVE:The 36-item Short Form Health Survey Questionnaire (SF-36) is a widely used generic health status measure. Recently it has been adapted to produce a disease-specific measure for MS-the 54-item Multiple Sclerosis Quality of Life Scale (MSQOL-54)-composed of five unchanged SF-36 scales; three altered SF-36 scales (one item added to each scale); and five new scales incorporating 15 additional items. This study evaluates the impact of these additions by comparing the measurement properties of the MSQOL-54 with the SF-36. METHODS:A total of 150 patients with MS, representing a broad spectrum of disease severity, completed a range of questionnaires, which included the MSQOL-54 (from which the SF-36 score was computed). Of these, 44 people completed the measures before and after inpatient rehabilitation to evaluate responsiveness. Standard psychometric methods were used to evaluate the measurement properties. RESULTS:The measurement properties of the unchanged scales, inevitably, remain identical. Those of the three altered scales are virtually identical. Of the five new scales, the validity of the two sexual scales is questioned because of the high percentage of missing data, and the validity of the overall quality-of-life scale is limited as demonstrated by the low to moderate correlations with other related and unrelated measures. Responsiveness of the new scales also appears limited. CONCLUSION:Modifying existing measures by simply adding clinically chosen items may not be as useful as anticipated in improving the measurement properties of an instrument.
journal_name
Neurologyjournal_title
Neurologyauthors
Freeman JA,Hobart JC,Thompson AJdoi
10.1212/wnl.57.1.68subject
Has Abstractpub_date
2001-07-10 00:00:00pages
68-74issue
1eissn
0028-3878issn
1526-632Xjournal_volume
57pub_type
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