Wie lassen sich bulimische Symptome erfassen? Ein psychometrischer Vergleich von Fragebogenskalen

Abstract

How Can Bulimic Symptoms Be Assessed? A Psychometric Comparison of Questionnaire Scales Background: There are several questionnaires available aiming at assessing aspects of eating and body concern in women with bulimia nervosa. In the present study, construct validity of various scales is examined. In addition, scales are compared with respect to reliability and discriminant validity. Methods: A total of 12 scales taken from 5 questionnaires were included. The scales were evaluated in a sample of women with bulimia nervosa and in a sample of healthy women. Results: The scales could be assigned to three dimensions (''Disturbed Eating'', ''Restrictive Eating'', and ''Body Dissatisfaction''). There are significant differences between scales tapping into the same dimension with respect to reliability and validity. Conclusion: If reliability and validity are taken into account when selecting a small number of questionnaires to assess symptoms of bulimia nervosa, usage of the «Fragebogen zum Ernährungsverhalten II» (FEV-II, based on the Dutch Eating Behaviour Questionnaire) along with the «Fragebogen zum Figurbewusstsein» (FFB; Body Shape Questionnaire, BSQ) is favorable.

The German Version of the Dutch Eating Behavior Questionnaire: Psychometric Properties, Measurement Invariance, and Population-Based Norms

“…Results for corrected item-total correlations and item homogeneity were satisfactory reflecting findings for the Dutch original version [ 6 ]. Cronbach’s α exceeded the critical value of .80 for all subscales indicating good internal consistency, which is in accordance with findings for the Dutch original version [ 6 ] and previous findings for the German version of the DEBQ, based on small convenience or clinical samples [ 18 , 23 – 26 ]. The internal consistency of the DEBQ subscales was equally high across genders, different age-groups and BMI-status, indicating that the German version of the DEBQ reliably measures eating behavior across different subgroups.…”

“…lets you down; eating when frightened; eating when emotionally upset) were removed resulting in a total number 30 items (10 items per subscale), 2) while the items in the Dutch original and English version of the DEBQ were formulated as questions, items in the German version of the DEBQ were formulated as statements (e.g., emotional eating: ‘When I’m irritated, I have a desire to eat‘; external eating: ‘I eat more than usually when I see others eating.’; restraint: ‘I deliberately eat less in order not to become heavier’). The three subscales of the German 30-item version of the DEBQ have been found to have good internal consistency in different studies (0.81 ≤ α ≤ 0.94) [ 18 , 23 – 26 ]. Despite the extensive use of the German version of the DEBQ, little is known about its factor structure thus far.…”