Parkinson’s Disease Sleep Scale 2: application in an Italian population

Nov 2, 2015Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology

Using the Parkinson's Disease Sleep Scale 2 with People in Italy

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Abstract

The Italian version of the PD sleep scale demonstrated satisfactory internal consistency with a Cronbach's α of 0.77.

The PDSS-2 showed high reliability with a test-retest correlation coefficient of 0.943.
Total PDSS-2 scores were significantly correlated with scores from other clinical assessments.
Factor analysis revealed five distinct areas of nocturnal disturbances in patients with Parkinson's Disease.
These five factors included movement-related issues, sleep quality, dreaming distress, sleep fragmentation, and insomnia symptoms.
The PDSS-2 has been validated as an effective tool for assessing sleep disturbances in Italian patients with Parkinson's Disease.

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Sleep disturbances and nocturnal disabilities are common in Parkinson's Disease (PD). The PD sleep scale, second version (PDSS-2), has been proposed as a helpful tool for measuring sleep disorders in PD. We aimed to validate the Italian version of the PDSS-2. One hundred and twenty-three consecutive PD outpatients (76 males) were evaluated by means of PDSS-2, Epworth Sleepiness Scale, Hamilton Depression Rating Scale, Parkinson's Disease Quality of Life Questionnaire (self-administered scales), Unified Parkinson's Disease Rating (motor section) and Hoehn and Yahr Scales, and Mini Mental State Examination. PDSS-2 internal consistency was satisfactory (Cronbach's α: 0.77) with significant item to total score correlation and high intra-class correlation coefficient for test-retest reliability (0.943). Total PDSS-2 score was correlated with the scores on all other clinical scales. The factor analysis identified five factors, related to five areas of nocturnal disturbances, similarly as the original PDSS-2. The five factors mainly reflected: (1) nocturnal movement-related problems, (2) quality of sleep, (3) dreaming distress, (4) fragmentation of sleep and (5) insomnia symptoms. The PDSS-2 scale has confirmed its usefulness in evaluating sleep problems in Italian PD patients.

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Parkinson’s Disease Sleep Scale 2: application in an Italian population

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