Can we get more from the Epworth Sleepiness Scale (ESS) than just a single score?

Michelle Olaithe; Timothy C. Skinner; Jemma Clarke; Peter Eastwood; Romola S. Bucks

doi:10.1007/s11325-012-0763-6

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Can we get more from the Epworth Sleepiness Scale (ESS) than just a single score?

Journal article

Peer reviewed

Can we get more from the Epworth Sleepiness Scale (ESS) than just a single score?

Michelle Olaithe, Timothy C. Skinner, Jemma Clarke, Peter Eastwood and Romola S. Bucks

Sleep & breathing, Vol.17(2), pp.763-769

2013

DOI: https://doi.org/10.1007/s11325-012-0763-6

PMID: 22927106

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Abstract

Epworth

ESS

Confirmatory factor analysis

CFA

Sleepiness

Somnificity

Purpose The Epworth Sleepiness Scale (ESS) is a widely used tool for measuring sleepiness. In addition to providing a single measure of sleepiness (a one-factor structure), the ESS also has the capacity to provide additional information about specific factors that facilitate sleep onset, including a person’s posture, activity and environment. These features of sleepiness are referred to as somnificity. This study evaluates and compares the fit of a one-factor structure (sleepiness) and three-factor structure (reflecting low, medium and high levels of somnificity) for the ESS. Methods All participants (a community sample N = 356 and a clinical sample N = 679) were administered the ESS. Confirmatory factor analysis was used to evaluate and compare the fit of one- and three-factor models of the ESS. Results In both samples, a three-factor structure (community sample adjusted X 2 = 2.95, root mean square error of approximation (RMSEA) = 0.07, Comparative Fit Index (CFI) = 0.95; clinical sample adjusted X 2 = 3.98, RMSEA = 0.07, CFI = 0.98) provided a level of model fit that was at least as good as the one-factor structure (community sample adjusted X 2 = 5.01, RMSEA = 0.11, CFI = 0.87; clinical sample adjusted X 2 = 8.87, RMSEA = 0.11, CFI = 0.92). Conclusions In addition to a single measure of sleepiness, the ESS can provide subscale scores which relate to three underlying levels of somnificity. These findings suggest that the ESS can be used to measure an individual’s overall sleep propensity as well as more specific measures of sleep propensity in low, moderate and high levels of situational somnificity.

Details

Title: Can we get more from the Epworth Sleepiness Scale (ESS) than just a single score?
Authors/Creators: Michelle Olaithe - The University of Western Australia
Timothy C. Skinner - University of Tasmania
Jemma Clarke - The University of Western Australia
Peter Eastwood - The University of Western Australia
Romola S. Bucks - The University of Western Australia
Publication Details: Sleep & breathing, Vol.17(2), pp.763-769
Publisher: Springer Nature
Number of pages: 7
Identifiers: 991005592655007891
Murdoch Affiliation: Vice Chancellery
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 1 Clinical & Life Sciences; 1.137 Sleep Science & Circadian Systems; 1.137.382 Obstructive Sleep Apnea
Web Of Science research areas: Clinical Neurology; Respiratory System
ESI research areas: Neuroscience & Behavior