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  • Title: Psychometric evaluation of a Brazilian version of the impact of weight on quality of life (IWQOL-Lite) instrument.
    Author: de A Mariano MH, Kolotkin RL, Petribú K, de N L Ferreira M, Dutra RF, Barros MV, Almeida NC, de L Filho LE, Rabelo PJ, Monteiro V, da Silva BF.
    Journal: Eur Eat Disord Rev; 2010 Jan; 18(1):58-66. PubMed ID: 20054878.
    Abstract:
    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.
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