OBJECTIVE: A global multidisciplinary consensus initiative identified eight patient-reported outcome domains important in obesity care: self-esteem; physical, mental, and social health; eating; stigma; body image; and excess skin. Several of these domains are not represented in generic preference-based measures typically used in weight loss research. We developed the BODY-Q-7 Dimensions (BODY-Q-7D) to provide a valuation-ready framework for a preference-based instrument. METHODS: Concepts from the BODY-Q were used to inform the development of items that covered the eight consensus initiative domains. Psychometric performance of the BODY-Q-7D was examined using an online international sample (i.e., Prolific). RESULTS: Content validity was established with 123 participants. The field test included 770 participants, of whom 269 completed a test-retest, and 599 completed a 3-month follow-up. Rasch Measurement Theory analysis reduced the BODY-Q-7D to 7 items. Items fit the Rasch model with ordered thresholds and structural independence. Reliability was > 0.80 across three reliability coefficients. Hypothesis-based tests of construct validity and responsiveness were supported with 22/28 (79%) and 12/16 (75%) tests accepted. CONCLUSIONS: The BODY-Q-7D demonstrated strong psychometric performance in a weight loss sample. The next phase of development is to elicit and model preference weights to assign utility values to each defined health state.
Klassen et al. (Thu,) studied this question.
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