Psychometric evaluation of a Brazilian version of the impact of weight on quality of life (IWQOL-Lite) instrument.


Journal Article

PURPOSE: The impact of weight on quality of life (IWQOL-Lite) is a self-administered instrument that assesses quality of life in obesity. It is composed of 31 items and five domains (physical function, self-esteem, sexual life, public distress, and work). The aim of the present study was to evaluate reliability (test-retest), internal structure, construct validity and discriminant validity. METHODS: IWQOL-Lite scores were obtained from 89 people in a Weight Watchers institution (clinical sample) and 156 community volunteers (community sample). The participants were selected based on the same criteria: gender (female) and age (> 24 years), except for BMI. The community sample also completed the SF-36, a generic measure of health-related quality of life. RESULTS: The Brazilian IWQOL-Lite demonstrated good test-retest reliability, internal consistency, discriminative validity and convergent validity. CONCLUSIONS: The IWQOL-Lite is the first specific instrument validated in Brazil for assessing quality of life in obesity. The results reveal that IWQOL-Lite is an instrument with good psychometric properties. Nevertheless, in some cases results were dissimilar to those reported in earlier studies using the original American English.

Full Text

Duke Authors

Cited Authors

  • de A Mariano, MH; Kolotkin, RL; Petribú, K; de N L Ferreira, M; Dutra, RF; Barros, MVG; Almeida, NC; de L Filho, LE; Rabelo, PJ; Monteiro, V; da Silva, BF

Published Date

  • January 2010

Published In

Volume / Issue

  • 18 / 1

Start / End Page

  • 58 - 66

PubMed ID

  • 20054878

Pubmed Central ID

  • 20054878

Electronic International Standard Serial Number (EISSN)

  • 1099-0968

Digital Object Identifier (DOI)

  • 10.1002/erv.969


  • eng

Conference Location

  • England