Cited by 1,106Sleep and Work-Related FatigueCircadian rhythm and melatoninSleep and related disorders

Evaluation of three circadian rhythm questionnaires with suggestions for an improved measure of morningness.

Smith, Carlla S., Reilly, Christopher, Midkiff, Karen·1989·Journal of Applied Psychology

Abstract

Circadian rhythms, cyclic fluctuations in many physiological and psychological functions, are thought to influence adjustment to shiftwork. A widely acknowledged individual difference in circadian rhythms, commonly called morningness, indicates preferences associated with morning or evening activities. Various self-report instruments have been developed to measure morningness, although little measurement data have been published for these scales. Because morningness scales are being used to select workers for night shiftwork, psychometric evaluations of these scales are needed. Psychometric assessments of undergraduate responses (N = 501) on three widely used scales indicate internal (interitem) measurement deficiencies in all three. Therefore, a 13-item scale was developed that distills the best items from two of these scales. Relationships between the new composite scale and external criteria are comparable with or stronger than similar relationships between the published scales and external criteria.

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Crossref · 10.1037/0021-9010.74.5.728

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Authors
Smith, C. S., Reilly, C., & Midkiff, K.
Affiliations
Bowling Green State University (US)
Venue
Journal of Applied Psychology
Published
1989
Volume
74
Issue
5
Pages
728-738
ISSN
  • 0021-9010 (ISSN-L)
  • 1939-1854
OpenAlex
W2069428327
Cited by
1,106
References
0
Citations by year
2026: 39 · 2025: 47 · 2024: 48 · 2023: 53 · 2022: 45 · 2021: 77 · 2020: 56 · 2019: 54 · 2018: 70 · 2017: 58 · 2016: 51 · 2015: 59 · 2014: 67 · 2013: 42 · 2012: 44
FWCI
3.39
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Psychology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
Keywords
circadian rhythm, morningness, eveningness, scale development, psychometric assessment, internal consistency, shift work, self-report measures, composite scale
MeSH terms
Circadian Rhythm, Humans, Psychometrics, Surveys and Questionnaires, Work, Work Schedule Tolerance

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