Does adding MS-specific items to a generic measure (the SF-36) improve measurement?

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

Neurology

journal_title

Neurology

authors

Freeman JA,Hobart JC,Thompson AJ

doi

10.1212/wnl.57.1.68

subject

Has Abstract

pub_date

2001-07-10 00:00:00

pages

68-74

issue

1

eissn

0028-3878

issn

1526-632X

journal_volume

57

pub_type

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