BMJ Open (Jan 2021)

Internal consistency and factor structure of Jenkins Sleep Scale: cross-sectional cohort study among 80 000 adults

  • Jussi Vahtera,
  • Mika Kivimäki,
  • Saana Myllyntausta,
  • J P A Arokoski,
  • Jenni Ervasti,
  • Juhani Juhola,
  • M Saltychev

DOI
https://doi.org/10.1136/bmjopen-2020-043276
Journal volume & issue
Vol. 11, no. 1

Abstract

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Objectives To assess the internal consistency and construct validity of the Finnish translation of the Jenkins Sleep Scale (JSS) in a large healthy working-age population with diverse work characteristics.Design Survey-based cross-sectional cohort study.Setting Survey conducted by an institute of occupational health.Participants Employees of 10 towns and 6 hospital districts.Primary and secondary outcome measures The internal consistency defined by a Cronbach’s alpha. Exploratory and confirmatory factor analyses to evaluate the construct structure of the JSS.Results Of 81 136 respondents, 14 890 (18%) were men and 66 246 (82%) were women. Their average age was 52.1 (13.2) years. Of the respondents, 41 823 (52%) were sleeping 7 or less hours per night. The mean JSS total score was 6.4 (4.8) points. The JSS demonstrated high internal consistency with an alpha of 0.80 (lower 95% confidence limit 0.80). Exploratory factor analysis supported a one-factor solution with eigenvalue of 1.94. Confirmatory factor analysis showed that all four items were positively correlated with a single common factor explaining 44%–61% of common factor’s variance.Conclusions The Finnish translation of JSS was found to be a unidimensional scale with good internal consistency. As such, the scale may be recommended as a practicable questionnaire when studying sleep difficulties in a healthy working-age population.