Reliability and Validity of the Persian Version of the Fatigue Severity Scale in Idiopathic Parkinson’s Disease Patients

Table 4

Trans-cultural reliability and validity of the different language versions of the FSS questionnaire in Parkinson’s disease patients.

Study group	Year	Language	Reliability		Validity
			Internal consistency; (Spearman R)	Internal consistency (Cronbach’s 𝛼)	Correlation coefficient; (UPDRS)	Correlation coefficient; (Hoehn and Yahr)
Hagell et al. [19]	2006	Swedish	—	0.94	—	—
Grace et al. [20]	2007	English	0.44–0.78	0.91	—	—
Valderramas et al. [21]	2012	Brazilian-Portuguese	—	0.95	0.45	0.40
Current study	2013	Persian	0.76–0.92	0.96	0.55	0.48