Abstract
Objective:
To assess the validity and reliability of a Numeric Rating Scale (NRS) for the measurement of spasticity in multiple sclerosis.
Design:
Longitudinal study with multiple comparators over two clinic visits.
Setting:
Rehabilitation Centre in the North East of England, UK.
Subjects:
A total of thirty-five patients, with a diagnosis of multiple sclerosis (MS) that were attending a rehabilitation clinic.
Results:
The test/re-test reliability of the NRS showed there was a high correlation between the two visits (r = 0.672). Construct validity was assessed by examining the relationship between the mean spasticity NRS and each of the other spasticity assessment tools. There was a statistically significant correlation between subject’s mean NRS diary scores and the Modified Ashworth Scale scores at both visits (Visit 1, r = 0.459, p = 0.0056; Visit 2, r = 0.446, p = 0.0106). There was a moderate, statistically significant correlation between the mean NRS diary scores and the Tardieu Scale (Visit 1, r = 0.429, p = 0.0113; Visit 2, r = 0.407, p = 0.0209).
Conclusions:
The spasticity NRS has been shown to be a valid and reliable tool in the assessment of spasticity with a moderate to high level of correlation with other clinician rated instruments used to assess spasticity.
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