Turkish adaptation of Parkinson fatigue scale and investigating its psychometric properties

Abstract

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 α 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 α 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.

<p>Validation study of the Parkinson&rsquo;s Fatigue Scale in advanced Parkinson&rsquo;s disease</p>

“…In agreement with the confirmatory analysis of previous studies,18,22,23 our exploratory factor analysis showed results compatible with the unidimensional nature of the PFS-16, including the amount of variance explained (67% vs 64%).…”

“…Furthermore, as measured by Cronbach’s alpha, the internal consistency for the scale in our study (0.93) was in line with those found in previous studies 18–24. Similarly, corrected item-total correlations (Table 4) overlap previous findings 20–23. Item homogeneity (r S =0.19) was found to satisfy the accepted value of ≥0.15, indicating sufficient association among the items 19,22.…”

“…We found that sex, age, education level, time from diagnosis, HY, LEDD, and CGI-S were not related to the presence or severity of fatigue – findings shared with other studies and indicative of a weak discriminant validity of the scale for these groupings 19–23,58. Marital status showed no significant differences in the PFS-16 total score.…”

“…Like Hagell et al49 and others,21,22 we found a weak correlation between the PFS-16 and UPDRS III and IV, whereas a moderate correlation was obtained by other researchers 19,23…”

Fatigue in Parkinson’s disease: Brazilian validation of the modified fatigue impact scale

“…In the present study, the individuals reported the dose of levodopa levels and many of them use other antiparkinsonian medicine associated. Other studies also confirmed the association of the presence or severity of fatigue (HY) and LEDD 35,36,37 .…”