title: Psychometric evaluation of the German version of the impact of weight on Quality of Life-Lite (IWQOL-Lite) questionnaire.
abstract: OBJECTIVE
  To evaluate the psychometric properties of a German version of the Impact of Weight on Quality of Life-Lite (IWQOL-Lite) questionnaire.
  
  
  METHODS
  IWQOL-Lite scores were obtained from 351 overweight/obese individuals and 127 lean adult volunteers. In addition, a subgroup of 126 obese subjects completed also the German versions of the 36-item short-form health survey (SF-36), the Beck Depression Inventory (BDI), the Eating Disorder Examination-Questionnaire (EDE-Q), and the German validated version of the Three-Factor Eating Questionnaire (TFEQ).
  
  
  RESULTS
  The German version of the IWQOL-Lite has psychometric properties comparable to those found for the original version and demonstrates high internal consistency and excellent construct validity. Furthermore, the German IWQOL-Lite clearly discriminates between groups based on BMI on all subscales and the total score.
  
  
  CONCLUSIONS
  The results of the present study suggest that the German IWQOL-Lite is a psychometrically validated instrument with which to measure weight-specific health related quality of life.
authors.affiliation: Department of Psychosomatic Medicine and Psychotherapy, University of Erlangen- Nuremberg, Germany. astrid.mueller@uk-erlangen.de
authors.forename: A
authors.initials: A
authors.lastname: Mueller
authors.forename: C
authors.initials: C
authors.lastname: Holzapfel
authors.forename: H
authors.initials: H
authors.lastname: Hauner
authors.forename: R D
authors.initials: RD
authors.lastname: Crosby
authors.forename: S G
authors.initials: SG
authors.lastname: Engel
authors.forename: B
authors.initials: B
authors.lastname: Mühlhans
authors.forename: R L
authors.initials: RL
authors.lastname: Kolotkin
authors.forename: J E
authors.initials: JE
authors.lastname: Mitchell
authors.forename: T
authors.initials: T
authors.lastname: Horbach
authors.forename: M de
authors.initials: Md
authors.lastname: Zwaan
mesh_terms: D000328:Adult; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology*; D005260:Female; D005858:Germany; D006306:Health Surveys / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology / Q000523:psychology; D050177:Overweight / Q000453:epidemiology / Q000523:psychology; D011594:Psychometrics / Q000379:methods; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires