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Understanding the population structure of the GHQ-12: Methodological considerations in dimensionally complex measurement outcomes

Research output: Contribution to journalArticle

Original languageEnglish
Article number112638
Number of pages10
JournalSocial Science and Medicine
Volume243
Early online date21 Oct 2019
DOIs
DateAccepted/In press - 18 Oct 2019
DateE-pub ahead of print - 21 Oct 2019
DatePublished (current) - 1 Dec 2019

Abstract

BACKGROUND: Mental health and its complexity, measurement and social determinants are increasingly important avenues of research for social scientists. Quantitative social science commonly investigates mental health as captured by population screening metrics. One of the most common of these metrics is the 12-Item General Health Questionnaire (GHQ-12). Despite itscanonical use as an outcome of interest in social science, the traditional use of the summed scores of summed questionnaires carries empirical and substantive assumptions which are often not fully considered or justified in the research. We outline the implications of these assumptions and the restrictions imposed by traditional modelling techniques and advocate for a more nuanced approach to population mental health modelling and inference.

DATA & METHODS: We use novel Exploratory Structural Equation Modelling (ESEM) on a large, representative UK sample taken from the first wave of the Understanding Society Survey, totalling 40,452 respondents. We use this to exemplify the potential of traditional, restrictive assumptions to bias conclusions and policy recommendations.

RESULTS: ESEM analysis identifies a 4-factor structure for the GHQ-12, including a newly proposed "Emotional Coping" dimension. This structure is then tested against leading proposed factor structures from the literature and is demonstrated to perform better across all metrics, under both Maximum Likelihood and Bayesian estimation. Moreover, the proposed factors are more substantively dissimilar than those retrieved from previous literature.

CONCLUSIONS: The results highlight the inferential limitations of using simple summed scores as population health outcomes. We advocate for the use of the highlighted methods, which in combination with population studies offer quantitative social scientists the opportunity to explore predictors and patterns of underlying processes of population mental health outcomes, explicitly addressing the complexity and measurement error inherent to mental health analysis.

    Research areas

  • Depression, GHQ-12, Mental health, Population health, Structural equation modelling, UK

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  • Full-text PDF (author’s accepted manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://doi.org/10.1016/j.socscimed.2019.112638 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 449 KB, PDF document

    Embargo ends: 21/10/20

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    Licence: CC BY-NC-ND

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