Improving the psychometric utility of the Hypomania Checklist (HCL-32): a Rasch analysis approach

Court, H., Forty, L., Jones, L., Gordon-Smith, K., Jones, I., Craddock, N. and Smith, D. (2014) Improving the psychometric utility of the Hypomania Checklist (HCL-32): a Rasch analysis approach. Journal of Affective Disorders, 152-54, pp. 448-453. (doi:10.1016/j.jad.2013.10.014)

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Publisher's URL: http://dx.doi.org/10.1016/j.jad.2013.10.014

Abstract


Background: The HCL-32 is a widely-used screening questionnaire for hypomania. We aimed to use a Rasch analysis approach to i) evaluate the measurement properties, principally unidimensionality, of the HCL-32, and ii) generate a score table to allow researchers to convert raw HCL-32 scores into an interval-level measurement which will be more appropriate for statistical analyses.

Methods: Subjects were part of the Bipolar Disorder Research Network (BDRN) study with DSM-IV bipolar disorder (n=389). Multidimensionality was assessed using Rasch fit statistics and principle components analysis of the residuals (PCA). Item invariance (differential item functioning, DIF) was tested for gender, bipolar diagnosis and current mental state. Item estimates and reliabilities were calculated.

Results: Three items (29, 30, 32) had unacceptable fit to the Rasch unidimensional model. Item 14 displayed significant DIF for gender and items 8 and 17 for current mental state. Item estimates confirmed that not all items measure hypomania equally.

Limitations: This sample was recruited as part of a large ongoing genetic epidemiology study of bipolar disorder and may not be fully representative of the broader clinical population of individuals with bipolar disorder.

Conclusion: The HCL-32 is unidimensional in practice, but measurements may be further strengthened by the removal of four items. Re-scored linear measurements may be more appropriate for clinical research.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Court, Dr Helen and Smith, Professor Daniel
Authors: Court, H., Forty, L., Jones, L., Gordon-Smith, K., Jones, I., Craddock, N., and Smith, D.
College/School:College of Medical Veterinary and Life Sciences > Institute of Health and Wellbeing > Mental Health and Wellbeing
Journal Name:Journal of Affective Disorders
Publisher:Elsevier BV
ISSN:0165-0327
ISSN (Online):1573-2517

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