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Do parent's global rating of well-being and disease activity of children with juvenile idiopathic arthritis yield different information?


The parents of children with juvenile idiopathic arthritis (JIA) are traditionally asked to provide a global assessment of disease status by rating the child's overall level of well-being (WB) on a 10-cm visual analogue scale (VAS). However, it has been advised that this measure does not provide a precise assessment of DA because it is largely affected by the presence of disease damage. For this reason, it has been suggested to substitute the VAS for WB with a VAS assessing specifically the level of DA.


To compare the construct validity of parent's global assessment of WB (Par WB) and parent's global assessment of DA (Par DA) in JIA.

Materials and methods

A parent of 403 JIA patients seen between 2007 and 2008 was asked to rate in 723 visits the level of child's WB and DA on two separate VAS. Construct validity of the two scales was compared by assessing their Spearman's correlation with other JIA outcome measures.


Table 1 shows Spearman's correlations.

Table 1 Spearman's correlations


Par WB and Par DA were highly correlated each other and their construct validity was very similar. These findings indicate that these two measures provide the same information and can, thus, be used interchangeably.

Author information

Correspondence to N Ullmann.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution 2.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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About this article


  • Public Health
  • Arthritis
  • Visual Analogue Scale
  • Disease Status
  • Construct Validity