Subtypes of sleep disturbance in parkinson’s disease based on the cross-culturally validated Korean version of Parkinson’s disease sleep scale-2

Hui Jun Yang, Han Joon Kim, Seong Beom Koh, Joong Seok Kim, Tae Beom Ahn, Sang Myung Cheon, Jin Whan Cho, Yoon Joong Kim, Hyeo Il Ma, Mee Young Park, Jong Sam Baik, Phil Hyu Lee, Sun Ju Chung, Jong Min Kim, In Uk Song, Ji Young Kim, Young Hee Sung, Do Young Kwon, Jae Hyeok Lee, Jee Young LeeJi Seon Kim, Ji Young Yun, Hee Jin Kim, Jin Yong Hong, Mi Jung Kim, Jinyoung Youn, Ji Sun Kim, Eung Seok Oh, Won Tae Yoon, Sooyeoun You, Kyum Yil Kwon, Hyung Eun Park, Su Yun Lee, Younsoo Kim, Hee Tae Kim, Sang Jin Kim

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5 Citations (Scopus)


Background and Purpose This study aimed to determine the clinimetric properties of the Korean version of Parkinson’s Disease Sleep Scale-2 (K-PDSS-2) and whether distinct subtypes of sleep disturbance can be empirically identified in patients with Parkinson’s disease (PD) using the cross-culturally validated K-PDSS-2. Methods The internal consistency, test–retest reliability, scale precision, and convergent validity of K-PDSS-2 were assessed in a nationwide, multicenter study of 122 patients with PD. Latent class analysis (LCA) was used to derive subgroups of patients who experienced similar patterns of sleep-related problems and nocturnal disabilities. Results The total K-PDSS-2 score was 11.67±9.87 (mean±standard deviation) at baseline and 12.61±11.17 at the retest. Cronbach’s α coefficients of the total K-PDSS-2 scores at baseline and follow-up were 0.851 and 0.880, respectively. The intraclass correlation coefficients over the 2-week study period ranged from 0.672 to 0.848. The total K-PDSS-2 score was strongly correlated with health-related quality of life measures and other corresponding nonmotor scales. LCA revealed three distinct subtypes of sleep disturbance in the study patients: “less-troubled sleepers,” “PD-related nocturnal difficulties,” and “disturbed sleepers.” Conclusions K-PDSS-2 showed good clinimetric attributes in accordance with previous studies that employed the original version of the PDSS-2, therefore confirming the cross-cultural usefulness of the scale. This study has further documented the first application of an LCA approach for identifying subtypes of sleep disturbance in patients with PD.

Original languageEnglish
Pages (from-to)66-74
Number of pages9
JournalJournal of Clinical Neurology (Korea)
Issue number1
Publication statusPublished - 2020 Jan

Bibliographical note

Funding Information:
This work was supported by a grant from Samil Pharmacy Company. The funder had no role in study design, data collection, data analysis, data interpretation or writing of the manuscript.

Publisher Copyright:
© 2020 Korean Neurological Association.

All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology


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