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The Behcet's disease activity index.

G Lawton1, B B Bhakta, M A Chamberlain

  • 1Academic Unit of Musculoskeletal and Rehabilitation Medicine, University of Leeds, Leeds, UK.

Rheumatology (Oxford, England)
|August 2, 2003
PubMed
Summary
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This study developed a new index for Behçet

Area of Science:

  • Rheumatology
  • Clinical Immunology
  • Epidemiology

Background:

  • Behçet's disease (BD) is a complex systemic vasculitis requiring accurate disease activity assessment.
  • International standardization of BD activity indices is crucial for research and clinical practice.

Purpose of the Study:

  • To identify and validate a subset of clinical features for an international Behçet's disease activity index.
  • To assess the suitability of a disease activity scale for cross-cultural and pooled data analysis.

Main Methods:

  • Rasch analysis was applied to data from 524 Behçet's disease patients across five countries.
  • 14 items from the Behçet's Disease Current Activity Form were evaluated for unidimensionality and hierarchy.
  • Differential item functioning (DIF) was assessed to identify cross-cultural variations.

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Main Results:

  • A 14-item scale showed good fit to the Rasch model within individual countries (Turkey, Korea, UK).
  • Pooled data analysis revealed poor fit and significant cross-cultural DIF in seven items.
  • After removing DIF items, a 26-item scale demonstrated good fit to the Rasch model for pooled data.

Conclusions:

  • A 14-item index is suitable for disease activity assessment within specific countries.
  • Rasch analysis facilitates valid international comparisons and data pooling for Behçet's disease activity.
  • The validated scale offers a quick and user-friendly tool for clinical and research settings.