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The Multiple Sclerosis Performance Test (MSPT): An iPad-Based Disability Assessment Tool
Published on: June 30, 2014
The development and validation of the impact of multiple sclerosis scale and the symptoms of multiple sclerosis scale
Lindsay McMillan1, Kathleen A Moore
1School of Psychology, Deakin University, 221 Burwood Highway, Burwood 3125, Australia.
Objective:
To develop and validate the Impact of Multiple Sclerosis Scale (IMSS) and the Symptoms of Multiple Sclerosis Scale (SMSS) using the Extended Disability Status Scale (EDSS) for construct validity.
Design:
Panel design involving test-retest over 4 months.
Setting:
A mailed survey.
Participants:
Volunteers with a diagnosis of multiple sclerosis (MS) recruited from an MS support service in Australia: 193 people (mean age, 39y) and 150 people participated at time 1 and time 2, respectively.
Interventions:
Not applicable.
Main Outcome Measures:
Principal components analyses, the Cronbach alpha, and descriptive statistics for the 2 scales; correlations for construct validity with the EDSS and retest; and confirmatory factor analysis to test the stability of IMSS and SMSS components over time.
Results:
The IMSS yielded 5 independent and reliable components; the SMSS yielded 3 components; both component structures were stable over time. These scales showed convergent validity with the EDSS.
Conclusions:
The IMSS and SMSS are psychometrically sound scales suitable for clinical and research purposes to assess the symptoms and impact of MS.
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