Psychometric evaluation of the Early/Late Preferences Scale

Bohle, P., Tilley, A. J. and Brown, S. (2001) Psychometric evaluation of the Early/Late Preferences Scale. Ergonomics, 44 10: 887-900. doi:10.1080/00140130110064694

Author Bohle, P.
Tilley, A. J.
Brown, S.
Title Psychometric evaluation of the Early/Late Preferences Scale
Journal name Ergonomics   Check publisher's open access policy
ISSN 0014-0139
Publication date 2001-08-01
Sub-type Article (original research)
DOI 10.1080/00140130110064694
Open Access Status Not yet assessed
Volume 44
Issue 10
Start page 887
End page 900
Total pages 14
Editor R. Stammers
Place of publication UK
Publisher Taylor & Francis
Language eng
Subject C1
380101 Sensory Processes, Perception and Performance
780108 Behavioural and cognitive sciences
Abstract This paper examines the psychometric quality of the Early/Late Preferences Scale (PS) relative to that of the Composite Morningness Scale (CS). Questionnaires were completed by 670 undergraduate students aged 16-37 years (mean 22.5), of whom 64% were female. Both scales displayed satisfactory inter-item correlations and similar total mean scores to those reported previously, although the CS had higher variability. Principal axis factor analysis produced single-factor solutions for both scales, although loadings for Items 7 and 9 on the PS were low. Internal consistencies for both scales were good (PS=0.86, CS=0.90) with only a small improvement achieved by deleting Items 7 and 9 from the PS. Test-retest reliability over 11 weeks was good for both scales (PS=0.92, CS=0.89). Differences between morning, evening and intermediate groups in self-rated alertness at different times of day, and significant correlations with other indices of morning-evening orientation, provided evidence of validity for both scales. These results indicate that PS is psychometrically comparable with CS. In view of its simpler format and lower cultural specificity, PS may be considered a preferable measure for most applications.
Keyword Engineering, Industrial
Psychology, Applied
Diurnal Type
Diurnal Type Scale
Shift Work
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Psychology Publications
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Citation counts: TR Web of Science Citation Count  Cited 36 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 41 times in Scopus Article | Citations
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Created: Wed, 15 Aug 2007, 02:43:58 EST