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Inflammatory Bowel Disease Questionnaire: cross-cultural adaptation and further validation
A G de Boer1, W Wijker, J F Bartelsman
1Department of Medicine, University of Amsterdam, Netherlands.
Objectives:
The Inflammatory Bowel Disease Questionnaire (IBDQ) is a disease-specific quality of life instrument. We translated and adapted the questionnaire and tested its reliability and (cross-cultural) validity.
Methods:
We surveyed 271 patients with inflammatory bowel disease. The inflammatory Bowel Disease Questionnaire and its dimensional scores (bowel, systemic, social and emotional) were correlated with disease activity, health care use, medication and three other indices of quality of life.
Results:
The reliability coefficient of the Inflammatory Bowel Disease Questionnaire was high (0.93). Patients with higher disease activity had significantly lower quality of life on all Inflammatory Bowel Disease Questionnaire dimensions (P < 0.001). Inflammatory Bowel Disease Questionnaire scores were significantly correlated with health care use (P < 0.01) but not with medication. Almost all Inflammatory Bowel Disease Questionnaire dimensions correlated highly (0.43-0.79, P < 0.001) with the corresponding scales of the standard quality of life indices, except for the bowel dimension. Modified Dutch Inflammatory Bowel Disease Questionnaire scores were consistent with Canadian Inflammatory Bowel Disease Questionnaire norms.
Conclusions:
These results support the Inflammatory Bowel Disease Questionnaire as a reliable and valid measure of the quality of life of inflammatory bowel disease patients in multicultural research settings.