Turkish adaptation of Parkinson fatigue scale and investigating its psychometric properties

Parkinson's disease (PD) is one of the most common chronic degenerative diseases of the nervous system. In PD, nonmotor symptoms are seen as frequently as motor symptoms. Fatigue can occur in all stages of PD and leads to significant disabilities. The aim of this study was to investigate the psychometric properties of the Turkish version of Parkinson fatigue scale (PFS). Ninety-six patients with idiopathic PD were included in this study with a cross-sectional and test-retest design. Structural validity, internal consistency and test-retest reliability of PFS were analyzed. For convergent validity, fatigue severity scale and modified fatigue impact scale were used. Internal consistency was determined by the Cronbach's alpha coefficient. For test-retest reliability, PFS was repeated after a 7-14-day period. Significant strong correlations were found between the PFS and the fatigue severity scale (r(s)=0.844) and the modified fatigue impact scale (r(s)=0.764), which indicate a high convergent validity. The Cronbach's alpha coefficient, which indicates the internal consistency of the scale, was calculated as 0.947. The test-retest reliability was found to be high (intraclass correlation coefficient=0.928). This study suggests that the Turkish version of PFS is valid and reliable. PFS is suitable for use by researchers and healthcare professionals to assess fatigue in Turkish-speaking patients with PD.