Fig. 1

Comparison of the frequency and score of sleep disturbances over the 2-year follow-up in different subgroups. Illustrates: In the radar chart, all values were normalized to baseline values (mean follow-up score/mean baseline score, or follow-up frequency/baseline frequency), and baseline values were set to 1.0. * Significant difference MSA, multiple system atrophy; MSA-P, multiple system atrophy with predominant parkinsonism; MSA-C, multiple system atrophy with predominant cerebellar ataxia; PDSS-2, Parkinson’s disease sleep scale-2; ESS, Epworth sleepiness scale; RBDSQ, rapid eye movement sleep behavior disorder screening questionnaire; PD-SP, Parkinson’s disease-related sleep problems; EDS, excessive daytime sleepiness; RBD, rapid eye movement sleep behavior disorder