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IWQOL© — Impact of Weight on Quality of Life

Assessment, Obesity

The Impact of Weight on Quality of Life-Lite (IWQOL-Lite) is a copyrighted, validated self-report measure of obesity-specific quality of life developed by Ronette “Ronnie” L. Kolotkin, Ph.D., obesity consultant, owner of Quality of Life Consulting, PLLC and a consulting professor at Duke University.

The IWQOL-Lite, developed using rigorous methods, demonstrates strong psychometric properties and is linguistically validated for ≥80 languages. Numerous research studies on persons with obesity, as well as clinical practices, use the IWQOL-Lite to assess patient-reported quality of life. The breadth of knowledge gained since its development in 2001 continues to be of value in clinical research and clinical practice.

An alternative version of the IWQOL-Lite (IWQOL-Lite-Clinical Trials, or IWQOL-Lite-CT) was developed to meet the developmental rigor required by the Food and Drug Administration (FDA) to support product labeling. The IWQOL-Lite-CT consists of 20 items optimized for use in the adult patient population typically targeted for obesity clinical trials, both with and without type 2 diabetes. It is anticipated that the final measure will be qualified by the FDA for use in clinical trials of new weight-loss medications to support product labeling claims.

Click here to download the poster presented at Obesity Week 2018, “Validation of a New Measure of Quality of Life in Obesity Trials: IWQOL-Lite Clinical Trials Version”, which describes the validation of the IWQOL-LITE-CT.

The IWQOL-Lite and the IWQOL-Lite-CT instruments are copyright Duke University. Pattern Health is the exclusive authorized distributor of the IWQOL-Lite and the IWQOL-Lite-CT.

  Ronette “Ronnie” L. Kolotkin, Ph.D

Ronette “Ronnie” L. Kolotkin, Ph.D


IWQOL-Lite©

Validated, 31-item, self-report measure of obesity-specific quality of life available in 87 languages.

Scores: Overall, Physical function, Self-esteem, Sexual life, Public distress, Work

Formats: Print/PDF, Web, App


IWQOL-Lite-Clinical Trials©

20 items optimized for use in the adult patient population typically targeted for obesity clinical trials, both with and without type 2 diabetes.

Scores: Overall, Physical, Physical function, Psychosocial

Formats: Print/PDF, Web, App