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Psychometric and cross‐national evaluation of a Portuguese version of the Impact of Weight on Quality of Life‐Lite (IWQOL‐Lite) questionnaire
Author(s) -
Engel Scott G.,
Kolotkin Ronette L.,
Teixeira Pedro J.,
Sardinha Luis B.,
Vieira Paulo N.,
Palmeira António L.,
Crosby Ross D.
Publication year - 2005
Publication title -
european eating disorders review
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.511
H-Index - 67
eISSN - 1099-0968
pISSN - 1072-4133
DOI - 10.1002/erv.614
Subject(s) - portuguese , quality of life (healthcare) , psychology , normative , european portuguese , gerontology , psychometrics , clinical psychology , medicine , philosophy , linguistics , epistemology , psychotherapist
Objective To evaluate the properties of a Portuguese version of the Impact of Weight on Quality of Life‐Lite (IWQOL‐Lite) questionnaire and to compare quality of life scores between samples of Portuguese and American women. Research Methods and Procedures IWQOL‐Lite scores were obtained from 138 Portuguese participants who were enrolled in a 2‐year lifestyle weight management programme (‘Portuguese clinical sample’) and 250 Portuguese volunteers from the community (‘Portuguese community sample’). Subjects were matched on gender (all female), BMI, age and treatment‐seeking status to American individuals from the IWQOL normative database who completed the IWQOL‐Lite in English. In addition, Portuguese community subjects completed the SF‐36 and their scores were compared to American individuals' scores from the normative database. The psychometric properties of the Portuguese version of the IWQOL‐Lite were determined, and Portuguese and American samples were compared on quality of life. Results The Portuguese and English versions of the IWQOL‐Lite appeared psychometrically very comparable. The Portuguese IWQOL‐Lite demonstrated excellent psychometric properties (internal consistency, correlations with BMI, factor structure, correlation with SF‐36, discriminant validity). Comparison of Portuguese and American subjects suggested that increasing BMI may have a more adverse effect on quality of life in Portuguese individuals as compared to Americans. Discussion The results suggest that the Portuguese translation of the IWQOL‐Lite is a reliable and valid measure of obesity‐specific quality of life. Obesity may have a greater impact on quality of life in Portuguese women compared to American women. Copyright © 2005 John Wiley & Sons, Ltd and Eating Disorders Association.