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Validity of a three-variable Juvenile Arthritis Disease Activity Score in children with new-onset juvenile idiopathic

Flora McErlane1, Michael W Beresford, Eileen M Baildam

  • 1Arthritis Research UK Epidemiology Unit, University of Manchester, , Manchester, UK.

Annals of the Rheumatic Diseases
|December 22, 2012
PubMed

Insights

Excluding erythrocyte sedimentation rate (ESR) from the Juvenile Arthritis Disease Activity Score (JADAS) improved its clinical applicability for most juvenile idiopathic arthritis (JIA) categories. The modified JADAS (JADAS3) showed excellent correlation with the original JADAS, supporting its use in routine clinical settings.

Area of Science:

  • Pediatric Rheumatology
  • Clinical Trial Methodology
  • Disease Activity Measurement

Background:

  • The Juvenile Arthritis Disease Activity Score (JADAS) is a key tool for assessing disease activity in juvenile idiopathic arthritis (JIA).
  • Its validity and feasibility across all JIA categories in routine clinical practice require further investigation.
  • The impact of excluding the erythrocyte sedimentation rate (ESR) on JADAS's correlation with disease markers is not fully understood.

Purpose of the Study:

  • To evaluate the validity and feasibility of JADAS in all JIA categories within a routine UK clinical setting.
  • To determine if excluding ESR (creating JADAS3) affects JADAS's correlation with single disease activity markers.

Main Methods:

  • JADAS and JADAS3 scores (versions 71, 27, and 10) were calculated at baseline for an inception cohort of children with JIA.
  • Correlation analyses were performed between JADAS, JADAS3, and individual disease activity/severity measures, stratified by JIA category.

Main Results:

  • JADAS and JADAS3 data were available for 352 and 551 children, respectively.
  • JADAS and JADAS3 scores varied significantly across JIA categories, with highest values in polyarticular disease patterns.
  • Excellent correlation was observed between JADAS and JADAS3 across all categories.
  • JADAS3-71 showed similar correlations to JADAS-71 with most indices, except ESR.

Conclusions:

  • This study provides evidence for the feasibility and construct validity of JADAS across all JIA categories in a UK routine clinical setting.
  • Excluding ESR from JADAS (JADAS3) appears to enhance its clinical applicability for most JIA categories.
  • JADAS3 demonstrates strong potential as a valid and practical measure of disease activity in JIA.
Abstract

Keywords:
Disease ActivityJuvenile Idiopathic ArthritisTreatment

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