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

Lookup NU author(s): Dr Flora McErlane, Emerita Professor Helen Foster



Objectives To investigate the validity and feasibility of the Juvenile Arthritis Disease Activity Score (JADAS) in the routine clinical setting for all juvenile idiopathic arthritis (JIA) disease categories and explore whether exclusion of the erythrocyte sedimentation rate (ESR) from JADAS (the JADAS3') influences correlation with single markers of disease activity.Methods JADAS-71, JADAS-27 and JADAS-10 were determined at baseline for an inception cohort of children with JIA in the Childhood Arthritis Prospective Study. JADAS3-71, JADAS3-27 and JADAS3-10 were determined using an identical formula but with exclusion of ESR. Correlation of JADAS with JADAS3 and single measures of disease activity/severity were determined by category.Results Of 956 eligible children, sufficient data were available to calculate JADAS-71, JADAS-27 and JADAS-10 at baseline in 352 (37%) and JADAS3 in 551 (58%). The median (IQR) JADAS-71, JADAS-27 and JADAS-10 for all 352 children was 11 (5.9-18), 10.4 (5.7-17) and 11 (5.9-17.3), respectively. Median JADAS and JADAS3 varied significantly with the category (Kruskal-Wallis p=0.0001), with the highest values in children with polyarticular disease patterns. Correlation of JADAS and JADAS3 across all categories was excellent. Correlation of JADAS71 with single markers of disease activity/severity was good to moderate, with some variation across the categories. With the exception of ESR, correlation of JADAS3-71 was similar to correlation of JADAS-71 with the same indices.Conclusions This study is the first to apply JADAS to all categories of JIA in a routine clinical setting in the UK, adding further information about the feasibility and construct validity of JADAS. For the majority of categories, clinical applicability would be improved by exclusion of the ESR.

Publication metadata

Author(s): Mcerlane F, Beresford MW, Baildam EM, Chieng SEA, Davidson JE, Foster HE, Gardner-Medwin J, Lunt M, Wedderburn LR, Thomson W, Hyrich KL, Childhood Arthrit Prospective

Publication type: Article

Publication status: Published

Journal: Annals of the Rheumatic Diseases

Year: 2013

Volume: 72

Issue: 12

Pages: 1983-1988

Print publication date: 01/12/2013

Online publication date: 20/12/2012

Acceptance date: 27/11/2012

Date deposited: 15/04/2015

ISSN (print): 0003-4967

ISSN (electronic): 1468-2060

Publisher: BMJ Publishing Group


DOI: 10.1136/annrheumdis-2012-202031


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