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IMPACT‐III is a valid and reliable questionnaire for assessing health‐related quality of life in Swedish children with inflammatory bowel disease
Author(s) -
Uggla C,
Lindh V,
Lind T,
Lindkvist M
Publication year - 2018
Publication title -
acta paediatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/apa.14119
Subject(s) - medicine , quality of life (healthcare) , discriminant validity , scale (ratio) , confirmatory factor analysis , disease , psychometrics , physical therapy , clinical psychology , structural equation modeling , statistics , internal consistency , physics , nursing , mathematics , quantum mechanics
Abstract Aim This study examined the reliability, validity and factor structure of the Swedish version of the IMPACT‐III questionnaire for assessing health‐related quality of life in children with inflammatory bowel disease. Methods We recruited 202 participants aged eight to 18 years, who were enrolled from 16 of the 23 paediatric gastroenterology clinics across Sweden during 2010–2013. This cross‐sectional study compared two versions of the IMPACT‐III questionnaire – one with six factors and 35 items and one with four factors and 19 items – plus the Paediatric Quality of Life Inventory 4.0 Generic Core Scale. Disease activity was assessed and defined as active or inactive. Results The mean total score for the six‐factor IMPACT‐III scale was 143.7/175, with a standard deviation (SD) of 17.9. There was a significant difference in mean total scores between the 133 children with inactive disease (147.8, SD: 14.9) and the 52 with active disease (133.0, SD: 20.3). Confirmatory factor analysis showed that the four‐factor scale was more robust than the original six‐factor scale. Concurrent validity and discriminant validity were high for both versions. Conclusion The Swedish version of the IMPACT‐III questionnaire was valid and reliable, but the shorter, four‐factor version is quicker and may be more convenient in clinical settings.