Open AccessValidation of an Instrument to Measure Quality of Life in British Children With Inflammatory Bowel Disease
Author(s) -
Ogden C.A.,
Akobeng A.K.,
Abbott J.,
Aggett P.,
Sood M.R.,
Thomas A.G.
Publication year - 2011
Publication title -
journal of pediatric gastroenterology and nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.206
H-Index - 131
eISSN - 1536-4801
pISSN - 0277-2116
DOI - 10.1097/mpg.0b013e3182165d10
Subject(s) - medicine , intraclass correlation , cronbach's alpha , discriminant validity , quality of life (healthcare) , face validity , content validity , reliability (semiconductor) , validity , embarrassment , concurrent validity , physical therapy , psychometrics , clinical psychology , psychology , internal consistency , nursing , social psychology , power (physics) , physics , quantum mechanics
Objective: To validate IMPACT‐III (UK), a health‐related quality of life (HRQoL) instrument, in British children with inflammatory bowel disease (IBD). Patients and Methods: One hundred six children and parents were invited to participate. IMPACT‐III (UK) was validated by inspection by health professionals and children to assess face and content validity, factor analysis to determine optimum domain structure, use of Cronbach alpha coefficients to test internal reliability, ANOVA to assess discriminant validity, correlation with the Child Health Questionnaire to assess concurrent validity, and use of intraclass correlation coefficients to assess test‐retest reliability. The independent samples t test was used to measure differences between sexes and age groups, and between paper and computerised versions of IMPACT‐III (UK). Results: IMPACT‐III (UK) had good face and content validity. The most robust factor solution was a 5‐domain structure: body image, embarrassment, energy, IBD symptoms, and worries/concerns about IBD, all of which demonstrated good internal reliability (α = 0.74–0.88). Discriminant validity was demonstrated by significant ( * P < 0.05, ** P < 0.01) differences in HRQoL scores between the severe, moderate, and inactive/mild symptom severity groups for the embarrassment scale (63.7 * vs 81.0 vs 81.2), IBD symptom scale (45.0 ** vs 64.2 * vs 80.6), and the energy scale (46.4 * vs 62.1 * vs 77.7). Concurrent validity of IMPACT‐III (UK) with comparable domains of the Child Health Questionnaire was confirmed. Test‐retest reliability was confirmed with good intraclass correlation coefficients of 0.66 to 0.84. Paper and computer versions of IMPACT‐III (UK) collected comparable scores, and there were no differences between the sexes and age groups. Conclusions: IMPACT‐III (UK) appears to be a useful tool to measure HRQoL in British children with IBD.