Modification of the EORTC QLQ-C30 (version 2.0) based on content validity and reliability testing in large samples of patients with cancer.
A revision of the Quality of Life Questionnaire (QLQ-C30) of the European Organization for Research and Treatment of Cancer (EORTC) was undertaken to improve low internal consistency estimates (Cronbach's alpha) and content validity for the role functioning scale and a conceptual difficulty (undue emphasis on physical functioning) in the global quality of life (QOL) scale.
The role functioning items were reworded and a four-category response format was substituted for the previous dichotomous format.
A new item asking about « overall health » was substituted for the « overall physical condition » item in the global QOL domain.
The original and new versions were tested at three time points in a total of 1,181 patients with cancer in Canada (n=696) and the Netherlands (n=485).
In both samples there was a marked improvement in internal consistency for the role functioning scale (Cronbach's alpha's ranging from 0.78-0.88) in the new version.
In the global QOL scale, the substitution of the new item for the previous one did not alter internal consistency (Cronbach's alpha's ranging from 0.81-0.92).
The revised versions of the role functioning and global QOL domains have been incorporated into the QLQ-C30 (version 2.0).
Mots-clés Pascal : Société, Sociologie, Questionnaire, Méthodologie, Amélioration, Processus, Tumeur maligne, Tumeur, Maladie, Validité, Epidémiologie, Méthode étude, Qualité vie, Mode de vie, Technique mesure
Mots-clés Pascal anglais : Society, Sociology, Questionnaire, Methodology, Improvement, Process, Malignant tumor, Tumor, Disease, Validity, Epidemiology, Investigation method, Quality of life, Life habit, Measurement technique
Notice produite par :
ORS Auvergne - Observatoire Régional de la Santé d'Auvergne
Code Inist : 002B30A11. Création : 16/10/1997.