Document Type : Original Article


1 1 Multiple Sclerosis Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran

2 Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran


BACKGROUND: Exercise self‑efficacy has been identified as one of the primary determinants of 
physical activity in people with multiple sclerosis (MS). Therefore, assessment of exercise self‑efficacy 
is important to be measured with valid and reliable scale to provide tailored interventions.
MATERIALS AND METHODS: The English version of the exercise self‑efficacy scale was translated 
into Persian using a forward‑backward translation approach. Factorial validity was conducted using 
the expletory factor analysis (EFA) and the confirmatory factor analysis (CFA). In addition, construct 
validity was performed using convergent and known‑group validity. Reliability was evaluated by internal 
consistency and test‑retest reliability. Participants were recruited from two hospitals (MS clinics).
RESULTS: Expletory factor analysis identified a single factor structure which explained 64.7% variance 
in exercise self‑efficacy scale (EXSE). CFA supported a single factor structure with a good model fit. 
Average variance extracted = 0.60 and composite reliability = 0.93 values confirmed the convergent 
validity. The known‑group validity was verified with significant differences between subgroups. The 
Cronbach’s alpha coefficient = 0.93 and intraclass correlation coefficient = 0.85 supported reliability 
of EXSE scale.
CONCLUSIONS: Our findings provided sufficient evidence of validity and reliability for EXSE scale 
in people with MS. This measure can utilize by researchers and health‑care providers in studies and 
clinical practice as a robust measure to assess exercise self‑efficacy and to develop interventions 
in people with MS.


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