251 Clustering in Central Disorders of Hypersomnolence Figure 1. Cluster means barcodes. Blue represents a low mean value or infrequent presence on a variable; red means a high mean value or frequent presence. Cluster sizes are displayed under the cluster number. Appendix B provides details on individual variables. AHI = apnoea-hypopnea index; BMI = body mass index; EDS = excessive daytime sleepiness; EIDS = episodes of irresistible daytime sleep; HLA = human leukocyte antigen; MSLT = multiple sleep latency testing; NS = nocturnal sleep; PLMI = periodic leg movement index; PSG = polysomnography; PVT = psychomotor vigilance task; REM = rapid eye movement; SOREMP = sleep-onset REM period. 9
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