Stochl, Jan orcid.org/0000-0002-9693-9930, Böhnke, Jan R orcid.org/0000-0003-0249-1870, Pickett, Kate E orcid.org/0000-0002-8066-8507 et al. (1 more author) (2015) Computerized adaptive testing of population psychological distress:simulation-based evaluation of GHQ-30. Social psychiatry and psychiatric epidemiology. ISSN 0933-7954
Abstract
PURPOSE: Goldberg's General Health Questionnaire (GHQ) items are frequently used to assess psychological distress but no study to date has investigated the GHQ-30's potential for adaptive administration. In computerized adaptive testing (CAT) items are matched optimally to the targeted distress level of respondents instead of relying on fixed-length versions of instruments. We therefore calibrate GHQ-30 items and report a simulation study exploring the potential of this instrument for adaptive administration in a longitudinal setting. METHODS: GHQ-30 responses of 3445 participants with 2 completed assessments (baseline, 7-year follow-up) in the UK Health and Lifestyle Survey were calibrated using item response theory. Our simulation study evaluated the efficiency of CAT administration of the items, cross-sectionally and longitudinally, with different estimators, item selection methods, and measurement precision criteria. RESULTS: To yield accurate distress measurements (marginal reliability at least 0.90) nearly all GHQ-30 items need to be administered to most survey respondents in general population samples. When lower accuracy is permissible (marginal reliability of 0.80), adaptive administration saves approximately 2/3 of the items. For longitudinal applications, change scores based on the complete set of GHQ-30 items correlate highly with change scores from adaptive administrations. CONCLUSIONS: The rationale for CAT-GHQ-30 is only supported when the required marginal reliability is lower than 0.9, which is most likely to be the case in cross-sectional and longitudinal studies assessing mean changes in populations. Precise measurement of psychological distress at the individual level can be achieved, but requires the deployment of all 30 items.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Health Sciences (York) The University of York > Faculty of Sciences (York) > Hull York Medical School (York) |
Depositing User: | Pure (York) |
Date Deposited: | 30 Mar 2016 15:47 |
Last Modified: | 21 Jan 2025 17:20 |
Published Version: | https://doi.org/10.1007/s00127-015-1157-4 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1007/s00127-015-1157-4 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:97420 |
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