Factor analysis of the Hamilton Depression Rating Scale in Parkinson's disease

M. P G Broen, A. J H Moonen, M. L. Kuijf, K. Dujardin, L. Marsh, I. H. Richard, S. E. Starkstein, P. Martinez-Martin, A. F G Leentjens

Research output: Contribution to journalArticle

Abstract

Introduction: Several studies have validated the Hamilton Depression Rating Scale (HAMD) in patients with Parkinson's disease (PD), and reported adequate reliability and construct validity. However, the factorial validity of the HAMD has not yet been investigated. The aim of our analysis was to explore the factor structure of the HAMD in a large sample of PD patients. Methods: A principal component analysis of the 17-item HAMD was performed on data of 341 PD patients, available from a previous cross sectional study on anxiety. An eigenvalue ≥1 was used to determine the number of factors. Factor loadings ≥0.4 in combination with oblique rotations were used to identify which variables made up the factors. Kaiser-Meyer-Olkin measure (KMO), Cronbach's alpha, Bartlett's test, communality, percentage of non-redundant residuals and the component correlation matrix were computed to assess factor validity. Results: KMO verified the sample's adequacy for factor analysis and Cronbach's alpha indicated a good internal consistency of the total scale. Six factors had eigenvalues ≥1 and together explained 59.19% of the variance. The number of items per factor varied from 1 to 6. Inter-item correlations within each component were low. There was a high percentage of non-redundant residuals and low communality. Conclusion: This analysis demonstrates that the factorial validity of the HAMD in PD is unsatisfactory. This implies that the scale is not appropriate for studying specific symptom domains of depression based on factorial structure in a PD population.

Original languageEnglish (US)
Pages (from-to)142-146
Number of pages5
JournalParkinsonism and Related Disorders
Volume21
Issue number2
DOIs
StatePublished - Feb 1 2015

Keywords

  • Depression
  • Factor analysis
  • Hamilton Depression Rating Scale
  • Parkinson's disease

ASJC Scopus subject areas

  • Geriatrics and Gerontology
  • Clinical Neurology
  • Neurology
  • Medicine(all)

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    Broen, M. P. G., Moonen, A. J. H., Kuijf, M. L., Dujardin, K., Marsh, L., Richard, I. H., Starkstein, S. E., Martinez-Martin, P., & Leentjens, A. F. G. (2015). Factor analysis of the Hamilton Depression Rating Scale in Parkinson's disease. Parkinsonism and Related Disorders, 21(2), 142-146. https://doi.org/10.1016/j.parkreldis.2014.11.016