title: Is the Eating Disorder Questionnaire-Online (EDQ-O) a valid diagnostic instrument for the DSM-IV-TR classification of eating disorders?
abstract: BACKGROUND
  The Eating Disorder Questionnaire-Online (EDQ-O) is an online self-report questionnaire, which was developed specifically to provide a DSM-IV-TR classification of anorexia nervosa (AN), bulimia nervosa (BN), binge-eating disorder (BED), and eating disorder not otherwise specified (EDNOS), without using a face-to-face clinical interview.
  
  
  OBJECTIVE
  The purpose of the present study was to examine the psychometric quality of the EDQ-O.
  
  
  METHODS
  The validity of the EDQ-O was determined by examining the agreement with the diagnoses obtained from the Longitudinal, Expert, and All DATA (LEAD) standard. Participants included 134 new patients of a specialist center for eating disorders located in the Netherlands.
  
  
  RESULTS
  Assessment of the validity of the EDQ-O yielded acceptable to good AUC (area under the receiver operating characteristic curve) values with a range from 0.72 to 0.83. Most other diagnostic efficiency statistics were also good except for a low sensitivity for AN (0.44), a low positive predictive value for BN (0.50), and a relatively low sensitivity for BED (0.66).
  
  
  CONCLUSIONS
  The results of the present study suggest that the EDQ-O performs acceptably as a diagnostic instrument for all DSM-IV-TR eating disorder classifications. However, suggestions are made to further improve the validity of the EDQ-O.
authors.affiliation: Tactus Addiction Treatment, Enschede, the Netherlands; Nijmegen Institute for Scientist-Practitioners in Addiction, Nijmegen, the Netherlands. Electronic address: e.terhuurne@tactus.nl.
authors.forename: Elke D
authors.initials: ED
authors.lastname: ter Huurne
authors.affiliation: Tactus Addiction Treatment, Enschede, the Netherlands; Nijmegen Institute for Scientist-Practitioners in Addiction, Nijmegen, the Netherlands.
authors.forename: Hein A
authors.initials: HA
authors.lastname: de Haan
authors.affiliation: Amarum, GGNet, Zutphen, the Netherlands.
authors.forename: Marieke C
authors.initials: MC
authors.lastname: ten Napel-Schutz
authors.affiliation: Tactus Addiction Treatment, Enschede, the Netherlands; Department of Psychology Health & Technology, University of Twente, Enschede, the Netherlands.
authors.forename: Marloes G
authors.initials: MG
authors.lastname: Postel
authors.affiliation: Expert Center for Chronic Fatigue, Radboud University Medical Center, Nijmegen, the Netherlands.
authors.forename: Juliane
authors.initials: J
authors.lastname: Menting
authors.affiliation: Medical School Twente, Medisch Spectrum Twente, Enschede, the Netherlands; Department of Research Methodology, Measurement and Data Analysis, University of Twente, Enschede, the Netherlands.
authors.forename: Job
authors.initials: J
authors.lastname: van der Palen
authors.affiliation: Amarum, GGNet, Zutphen, the Netherlands; Clinical Psychology Department, Radboud University Nijmegen, Nijmegen, the Netherlands.
authors.forename: Maartje S
authors.initials: MS
authors.lastname: Vroling
authors.affiliation: Nijmegen Institute for Scientist-Practitioners in Addiction, Nijmegen, the Netherlands; Behavioral Science Institute, Radboud University Nijmegen, Nijmegen, the Netherlands.
authors.forename: Cor A J
authors.initials: CA
authors.lastname: DeJong
mesh_terms: D000293:Adolescent; D000328:Adult; D000855:Anorexia / Q000175:diagnosis / Q000523:psychology; D019540:Area Under Curve; D056912:Binge-Eating Disorder / Q000175:diagnosis / Q000523:psychology; D002032:Bulimia / Q000175:diagnosis / Q000523:psychology; D039721:Diagnostic and Statistical Manual of Mental Disorders; D001068:Feeding and Eating Disorders / Q000145:classification* / Q000523:psychology*; D005260:Female; D006801:Humans; D020407:Internet; D008297:Male; D008875:Middle Aged; D011594:Psychometrics; D012372:ROC Curve; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D055815:Young Adult