TY - JOUR
T1 - BODY-Q Normative Scores
T2 - Psychometric Validation of the BODY-Q in the General Population in Europe and North America
AU - Dalaei, Farima
AU - De Vries, Claire E.E.
AU - Cano, Stefan J.
AU - Kaur, Manraj N.
AU - Poulsen, Lotte
AU - Pfob, André
AU - Mou, Danny
AU - Repo, Jussi P.
AU - Salzillo, Rosa
AU - Opyrchal, Jakub
AU - Sørensen, Jens A.
AU - Pusic, Andrea L.
AU - Klassen, Anne F.
N1 - Publisher Copyright:
© 2023 Lippincott Williams and Wilkins. All rights reserved.
PY - 2023/11/16
Y1 - 2023/11/16
N2 - Background: BODY-Q is a rigorously developed patient-reported outcome measure designed to measure outcomes of weight loss and body contouring patients. To allow interpretation and comparison of BODY-Q scores across studies, normative BODY-Q values were generated from the general population. The aim of this study was to examine the psychometric properties of BODY-Q in the normative population. Methods: Data were collected using two crowdsourcing platforms (Prolific and Amazon Mechanical Turk) in 12 European and North American countries. Rasch measurement theory (RMT) was used to examine reliability and validity of BODY-Q scales. Results: RMT analysis supported the psychometric properties of BODY-Q in the normative sample with ordered thresholds in all items and nonsignificant chi-square values for 167 of 176 items. Reliability was high with person separation index of greater than or equal to 0.70 in 20 of 22 scales and Cronbach alpha values of greater than or equal to 0.90 in 17 of 22 scales. Mean scale scores measuring appearance, health-related quality of life, and eating-related concerns scales varied as predicted across subgroups with higher scores reported by participants who were more satisfied with their weight. Analysis to explore differential item functioning by sample (normative versus field-Test) flagged some potential issues, but subsequent comparison of adjusted and unadjusted person estimates provided evidence that the scoring algorithm worked equivalently for the normative sample as in the field-Test samples. Conclusions: The BODY-Q scales showed acceptable reliability and validity in the normative sample. The normative values can be used as reference in research and clinical practice in combination with local estimates for parallel analysis and comparison.
AB - Background: BODY-Q is a rigorously developed patient-reported outcome measure designed to measure outcomes of weight loss and body contouring patients. To allow interpretation and comparison of BODY-Q scores across studies, normative BODY-Q values were generated from the general population. The aim of this study was to examine the psychometric properties of BODY-Q in the normative population. Methods: Data were collected using two crowdsourcing platforms (Prolific and Amazon Mechanical Turk) in 12 European and North American countries. Rasch measurement theory (RMT) was used to examine reliability and validity of BODY-Q scales. Results: RMT analysis supported the psychometric properties of BODY-Q in the normative sample with ordered thresholds in all items and nonsignificant chi-square values for 167 of 176 items. Reliability was high with person separation index of greater than or equal to 0.70 in 20 of 22 scales and Cronbach alpha values of greater than or equal to 0.90 in 17 of 22 scales. Mean scale scores measuring appearance, health-related quality of life, and eating-related concerns scales varied as predicted across subgroups with higher scores reported by participants who were more satisfied with their weight. Analysis to explore differential item functioning by sample (normative versus field-Test) flagged some potential issues, but subsequent comparison of adjusted and unadjusted person estimates provided evidence that the scoring algorithm worked equivalently for the normative sample as in the field-Test samples. Conclusions: The BODY-Q scales showed acceptable reliability and validity in the normative sample. The normative values can be used as reference in research and clinical practice in combination with local estimates for parallel analysis and comparison.
UR - http://www.scopus.com/inward/record.url?scp=85178059659&partnerID=8YFLogxK
U2 - 10.1097/GOX.0000000000005401
DO - 10.1097/GOX.0000000000005401
M3 - Article
C2 - 38025628
AN - SCOPUS:85178059659
SN - 2169-7574
VL - 11
SP - E5401
JO - Plastic and Reconstructive Surgery - Global Open
JF - Plastic and Reconstructive Surgery - Global Open
IS - 11
ER -