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J Marleau1, S Turgeon2, J Turgeon3

  • 1Direction de santé publique, Centre intégré de santé et de services sociaux de l'Outaouais, 104 rue Lois, Gatineau, Canada.

Revue D'Epidemiologie Et De Sante Publique
|January 15, 2022
PubMed
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Authors poorly report psychometric qualities of the Kessler Psychological Distress Scale (K6). Reliability coefficients are often missing or inconsistently reported, hindering accurate interpretation of distress data.

Area of Science:

  • Psychometrics
  • Health Survey Methodology
  • Psychological Measurement

Background:

  • The Kessler Abbreviated Psychological Distress Scale (K6) is widely used in population surveys.
  • Assessing the reliability of the K6 is crucial for accurate interpretation of psychological distress data.
  • Current reporting practices for psychometric assessments of the K6 require examination.

Purpose of the Study:

  • To identify psychometric assessment and reporting practices for the Kessler Abbreviated Psychological Distress Scale (K6) in Canadian population surveys.
  • To compare the performance of six different reliability coefficients when applied to K6 data.

Main Methods:

  • Study 1 involved a systematic review and synthesis of 71 publications that utilized K6 data.
  • Study 2 employed data from the Canadian Community Health Survey (CCHS) (2009-2010, 2013-2014) to compare reliability coefficients.
Keywords:
Alpha coefficientCoefficient alphaCoefficients de fidélitéDétresse psychologiqueEnquête populationnelleKessler Abbreviated Psychological Distress Scale (K6)Population SurveyPsychological DistressReliabilityÉchelle abrégée de détresse psychologique de Kessler (K6)

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  • Six reliability coefficients, including the alpha coefficient, were estimated and compared, with confidence intervals calculated for various respondent subgroups.

    • Main Results:

    • Only nine out of 71 publications reported a reliability coefficient based on their own sample.
    • The alpha coefficient was the only reliability measure reported, despite no stated conditions for its use.
    • Alternative reliability coefficients generally yielded higher values than the alpha coefficient, with notable variations across respondent subgroups.

    Conclusions:

    • There is a significant gap between recommended practices and the actual implementation of reliability coefficient reporting for the K6.
    • Authors need to enhance manuscript reporting to allow for proper assessment of the K6's psychometric properties.
    • Standardizing the reporting of reliability coefficients, including subgroup analyses and confidence intervals, is essential for precise data interpretation.