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

Table 3

The Spearman correlation to evaluate the convergent validity of the FSS questionnaire in association with the baseline and disease-related variables in Iranian Parkinson’s disease patients (𝑛=90).

Scale/variable	Spearman Rho	𝑃 value
Age	−0.070	0.512
Duration of disease	0.284	0.007 *
UPDRS Score
Part I-mental	0.264	0.012 *
Part II-ADL	0.519	<0.001*
Part III-motor	0.521	<0.001*
Part IV-complications	0.231	0.029 *
Total	0.548	<0.001*
Hoehn and Yahr stage	0.478	<0.001*
Schwab and England ADL scale	−0.487	<0.001*
Daily levodopa dose	0.128	0.233

∗Statistical significant correlation (𝑃<0.05).