SCOPA-Sleep39 (scales for outcomes in PD) is a self-rating scale created to access sleep quality and daytime sleepiness symptoms in patients with PD, occurring in the previous month. It includes three subscales: a nighttime scale (NS), a single-item quality of sleep scale (which was not used in this study) and a daytime sleepiness scale (DS). The NS contain five items, with four response options that address insomnia related complains (sleep initiation, sleep fragmentation, sleep efficiency, sleep duration, and early wakening). The maximum score of this scale is 15 (indicating worse symptoms), and the suggested cut-off is 6/7. The DS subscale evaluates daytime sleepiness, according to six items, with four response options. Scores range from 0 to 18, and the suggested cut-off score is 4/5.
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