[Validation of the new German translation version of the "Short Inflammatory Bowel Disease Questionnaire" (SIBDQ)]

In the face of a hardly predictable course of illness--potentially effecting a severe diminution of daily activities--the quality of life (QOL) represents a chief outcome measure in the treatment of inflammatory bowel diseases (IBD). For the German-speaking area an economical disease-specific instrument measuring QOL has been missing, so far. Therefore, we translated and adapted the recently validated "Short Inflammatory Bowel Disease Questionnaire" SIBDQ (11). Bowel symptoms, systemic symptoms, moods, and social activities are represented by a total of 10 items. Along with this questionnaire 7 accepted instruments assessing QOL-components were administered to 125 outpatients (54 ulcerative colitis, 71 Crohn's disease) and 51 healthy controls. The psychometric properties are good. Consistency is alpha = .84, thereby slightly surpassing the Anglo-American SIBDQ (alpha = .78). Retest-reliability after 26 weeks is r = .60. Systematic covariations with accepted QOL-instruments give evidence for its convergent and discriminatory validity. Differences between groups (high vs. low inflammatory activity vs. healthy controls) substantiate its sensitivity. Thus, the German adaptation of the accepted SIBDQ supplies an economic, reliable, and valid instrument that proved able to assess clinically relevant differences in QOL in patients with IBD. We suggest that it should be used by its overall score rather than its subscales. The instrument is appropriate to be used in therapy outcome and evaluation studies. It allows international comparison.