Validity of the childhood health assessment questionnaire is independent of age in juvenile idiopathic arthritis
Article first published online: 5 AUG 2004
Copyright © 2004 by the American College of Rheumatology
Arthritis Care & Research
Volume 51, Issue 4, pages 519–526, 15 August 2004
How to Cite
Pouchot, J., Ecosse, E., Coste, J., Guillemin, F., French Quality of Life Study Group and Paediatric Rheumatology International Trials Organisation (2004), Validity of the childhood health assessment questionnaire is independent of age in juvenile idiopathic arthritis. Arthritis & Rheumatism, 51: 519–526. doi: 10.1002/art.20529
- Issue published online: 5 AUG 2004
- Article first published online: 5 AUG 2004
- Manuscript Accepted: 19 OCT 2003
- Manuscript Received: 28 APR 2003
- European grant for Juvenile Idiopathic Arthritis Research. Grant Number: BMH4-CT98-3531
- Childhood Health Assessment Questionnaire;
- Rasch analysis;
- Juvenile idiopathic arthritis
To determine whether the Childhood Health Assessment Questionnaire (CHAQ) is valid for the comparison of different age subgroups and for longitudinal studies in juvenile idiopathic arthritis (JIA).
A CHAQ was administered to 306 children with JIA. Rasch analyses were used to compare the difficulty of each of the 30 items of the questionnaire for children of 2 age groups (≥10 years old and <10 years old).
Independent of the physical disability level assessed by the Rasch model, 8 of the 30 items (27%) of the CHAQ were rated significantly different in the 2 age groups. Despite this age-related variation in item difficulty, the impact on the CHAQ disability index using its original scoring system remained low (about 0.25 points on a scale of 0–3).
The difficulty of 8 of 30 items of the CHAQ depends on the respondent's age. Nevertheless, the design of the CHAQ and its scoring system remove most of the expected physical development bias.