Validity and Reliability of the Turkish Version of the Parkinson Disease Sleep Scale-2

Objective: Sleep problems are one of the most common non-motor symptoms of Parkinson's disease (PD). To better manage sleep problems, they must first be identified and evaluated. The study aimed to evaluate the validity and reliability of the Turkish version of the Parkinson Disease Sleep Scale-2 (PDSS-2). Materials and Methods: The study was conducted with 135 individuals with PD, between April 2019 and January 2021. The data were collected using the patient information form and the PDSS-2. The confirmatory factor analysis, psycholinguistic evaluation, and content validity testing were conducted to test the construct validity of the scale. Item total score correlation, Cronbach's alpha coefficient, and test-retest analyses were performed to test the reliability of the scale.Results: The content validity ratio of the scale was calculated as 0.875 and 1. When the model related to the scale was examined with the confirmatory factor analysis, it was observed that the fit indices were at a good level. The Cronbach's alpha was found to be 0.90 for the scale and between 0.71-0.81 for the sub-dimensions, indicating high reliability. The item-total correlations were found to be sufficient (between 0.31 and 0.78). The test-retest reliability coefficient was 0.91, indicating high consistency.Conclusion: It has been determined that the Turkish version of the PDSS-2 is a valid and reliable measurement tool.