uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Measurement properties and hierarchical item structure of the Epworth Sleepiness Scale in Parkinson's disease
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience.
2007 (English)In: Journal of Sleep Research, ISSN 0962-1105, E-ISSN 1365-2869, Vol. 16, no 1, 102-109 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this work was to evaluate the measurement properties and hierarchical item structure of the Epworth Sleepiness Scale (ESS) in patients with Parkinson's disease (PD). Data were taken from a cross-sectional study regarding fatigue and sleep-related aspects of PD. One hundred and eighteen consecutive patients with neurologist-diagnosed PD without significant co-morbidities (54% men; mean age, 64 years; mean PD duration, 8.4 years) from four Swedish neurological outpatient clinics participated. The ESS displayed good data quality with few missing items (0–2.5%): good reliability (Cronbach's alpha, 0.84), marginal floor and no ceiling effects (1.7% and 0% respectively), and differentiated between those reporting problems staying awake during the past month and those who did not. Item–total correlations, factor and Rasch analyses indicated that items tap a single underlying construct. Rasch analysis supported basic rating scale assumptions and demonstrated an item hierarchy similar to that previously found in patients with other sleep disorders. Gaps in the levels of sleep propensity covered by ESS items and their response options were identified at the higher and lower ends of the underlying sleepiness continuum. This study provides an evidence base for using the ESS in PD by demonstrating good psychometric properties and a stable hierarchical item structure. However, addition of new items and use of Rasch scoring has potential to further enhance the clinical usefulness of the ESS.

Place, publisher, year, edition, pages
2007. Vol. 16, no 1, 102-109 p.
Keyword [en]
Adult, Aged, Aged; 80 and over, Cross-Sectional Studies, Disorders of Excessive Somnolence/*diagnosis/*epidemiology, Fatigue/diagnosis/epidemiology, Female, Humans, Male, Middle Aged, Parkinson Disease/*epidemiology, Prevalence, Questionnaires, Reproducibility of Results, Severity of Illness Index
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-16626DOI: 10.1111/j.1365-2869.2007.00570.xISI: 000244277500013PubMedID: 17309769OAI: oai:DiVA.org:uu-16626DiVA: diva2:44397
Available from: 2008-05-30 Created: 2008-05-30 Last updated: 2011-02-15Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textPubMedhttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Retrieve&list_uids=17309769&dopt=Citation

Search in DiVA

By author/editor
Broman, Jan-Erik
By organisation
Department of Neuroscience
In the same journal
Journal of Sleep Research
Medical and Health Sciences

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 178 hits
ReferencesLink to record
Permanent link

Direct link