The Impact of Weight on Quality of Life-Lite (IWQOL-Lite)© is a validated, 31-item, self-report measure of obesity-specific quality of life in adults, available in multiple languages. The scale structure of the IWQOL-Lite has been verified with confirmatory factor analysis, and IWQOL-Lite scores are sensitive to changes in weight. There is strong evidence for validity and reliability.
In addition to a total score, there are scores on five domains:
Important: Scores range from 0 to 100, with 100 representing the best quality of life. Raw scores are no longer used for reporting. Read more about scoring here.
To date, a total of 81 harmonized translations of the IWQOL-Lite© have been developed in accordance with industry standards.
You may view key papers relating to IWQOL-Lite here.
How to Cite IWQOL-Lite
Kolotkin, R.L., Crosby, R.D., Kosloski, K.D., and Williams, G.R. Development of a brief measure to assess quality of life in obesity. Obesity Research, 2001, 9 (2), 102-111.
Kolotkin, R.L., Crosby, R.D. Psychometric evaluation of the Impact of Weight on Quality of Life-Lite questionnaire (IWQOL-Lite) in a community sample. Quality of Life Research, 2002, 11(2), 157-171.
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The new digital versions, which can be used standalone or integrated into digital care plans and clinical trials, will be more accessible and engaging for patients while improving the accuracy and reliability of the collected data.
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Important Note about Scoring
In order to be able to compare your results to those of other studies, it is important to score the IWQOL-Lite correctly (i.e. convert raw scores to transformed scores on a scale of 0-100, where 100 represents the best quality of life.)
Raw scores are no longer used for reporting. Read more here.