Reliability and Validity of the Persian Version of Multiple Sclerosis Spasticity Scale in Iranian Patients with Multiple Sclerosis

The aims of this study was to culturally adapt and validate the Persian-version of the Multiple Sclerosis Spasticity Scale and to present data on its psychometric properties in a sample of Iranian patients with multiple sclerosis.
Subjecrs and After standard forward and backward translations, 92 patients with MS completed the Persian versions of the MSSS-88 and MSQoL-54 in the first visit. With time interval of 2 days after the first visit, 40 patients filled out the MSSS-88 in the second visit. Test-retest reliability and internal consistency were assessed using intraclass correlation coefficient (ICC) and Cronbach's α coefficient, respectively. To evaluate construct validity of MSSS-88 compared to similar concepts of MSQoL-54, the spearman's rank correlation was used.
MSSS-88 has a high ICC level. The minimum Cronbach's alpha level of 0.70 was exceeded by MSSS-88. In terms of construct validity, most of a priori hypotheses were confirmed.
These results demonstrate the the Persian-version of the MSSS-88 is a culturally-adapted, reliable and valid measure in Iranian patients with Multiple Sclerosis.