Face and Content validity of Persian version of Parkinson Fatigue Scale (PFS-16) in people with Parkinson's disease

Parkinson’s disease (PD) is the second common neuro-degenerative disorder after Alzheimer’s disease (AD). Tremor at rest, rigidity, bradykinesia, and postural control impairments are the four main diagnostic symptoms of PD. However, people with PD reported several non-motor symptoms. Among non-motor symptoms, fatigue is the most widespread with the prevalence rates of 40-65 percent that can have impacts on the quality of life of these people. The purpose of the present study was to translate and evaluate face and content validity of Parkinson Fatigue Scale (PFS-16) in patients with Parkinsons.
Translation of this scale was done in two phases according to international quality of life assessment (IQOLA). Then, face validity was checked by 15 patients with Parkinson's disease and content validity was evaluated by 15 occupational therapists. To determine the content validity ratio (CVR) and content validity index (CVI), Lawshe’s method was used.
In the translation phase, only one question was changed because of conceptual problem. Face validity was very high for this measure. According to Lawshe, content validity ratio (CVR) and content validity index (CVI) were in the acceptable range.
Persian version of Parkinson Fatigue Scale (PFS-16) has high face and content validity which is good for assessing fatigue in people with Parkinsons.