Øyvind Rø1,2, Deborah L Reas1, Kristin Stedal1. 1. Regional Department of Eating Disorders, Division of Mental Health and Addiction, Oslo University Hospital, Oslo, Norway. 2. Division of Mental Health and Addiction, Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
Abstract
OBJECTIVE: To determine the optimal Eating Disorder Examination-Questionnaire (EDE-Q) global score to discriminate between female controls and patients by eating disorder (ED) diagnosis, body mass index (BMI) and age. METHOD: A sample of 1845 control participants and 620 patients from specialty ED treatment centres. RESULTS: Mean global EDE-Q was 4.00 [standard deviation (SD) = 1.32] for patients and 1.25 (SD = 1.10) for controls. Receiver operating characteristic analyses demonstrated an area under the curve of 0.93 (95% CI: 0.91-0.94), with an optimal cut-off score of 2.50 (sensitivity = 0.86; specificity = 0.86), ranging from 2.09 for anorexia nervosa, 2.62 for bulimia nervosa and 2.63 for ED otherwise not specified. Optimal cut-off scores also varied according to BMI, ranging from 1.62 (BMI ≤ 18.0 kg/m(2) ) to 3.26 (BMI ≥ 30 kg/m(2) ), with less variability for age, ranging inversely from 2.16 (>40 years) to 2.70 (<20 years). DISCUSSION: The global EDE-Q score showed high discriminant validity, and findings illustrate the particular importance of considering BMI and diagnosis when applying cut-offs based upon the EDE-Q.
OBJECTIVE: To determine the optimal Eating Disorder Examination-Questionnaire (EDE-Q) global score to discriminate between female controls and patients by eating disorder (ED) diagnosis, body mass index (BMI) and age. METHOD: A sample of 1845 control participants and 620 patients from specialty ED treatment centres. RESULTS: Mean global EDE-Q was 4.00 [standard deviation (SD) = 1.32] for patients and 1.25 (SD = 1.10) for controls. Receiver operating characteristic analyses demonstrated an area under the curve of 0.93 (95% CI: 0.91-0.94), with an optimal cut-off score of 2.50 (sensitivity = 0.86; specificity = 0.86), ranging from 2.09 for anorexia nervosa, 2.62 for bulimia nervosa and 2.63 for ED otherwise not specified. Optimal cut-off scores also varied according to BMI, ranging from 1.62 (BMI ≤ 18.0 kg/m(2) ) to 3.26 (BMI ≥ 30 kg/m(2) ), with less variability for age, ranging inversely from 2.16 (>40 years) to 2.70 (<20 years). DISCUSSION: The global EDE-Q score showed high discriminant validity, and findings illustrate the particular importance of considering BMI and diagnosis when applying cut-offs based upon the EDE-Q.
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