Psychometric Validation of the BODY-Q in Danish Patients Undergoing Weight Loss and Body Contouring Surgery

• Main Authors: Lotte Poulsen, MD, Anne Klassen, DPhil, PhD, Michael Rose, MD, Kirsten K. Roessler, DPhil, PhD, Claus Bogh Juhl, MD, PhD, René Klinkby Støving, MD, PhD, Stefan Cano, MSc, PhD, Jens Ahm Sørensen, MD, PhD
• Format: Article
• Language: English
• Published: Wolters Kluwer 2017-10-01
• Series: Plastic and Reconstructive Surgery, Global Open
• Online Access: http://journals.lww.com/prsgo/fulltext/10.1097/GOX.0000000000001529

Background:. A well-developed patient-reported outcome instrument is needed for use in Danish bariatric and body contouring patients. The BODY-Q is designed to measure changes in important patient outcomes over the entire patient journey, from obesity to post-body contouring surgery. The current study aims to psychometrically validate the BODY-Q for use in Danish patients. Methods:. The process consisted of 3 stages: translation and linguistic validation, field-test, and data analysis. The translation was performed in accordance with the International Society for Pharmacoeconomics and Outcomes Research and World Health Organization guidelines, and field-test data were collected in 4 departments in 2 different hospitals. Field-test data were analyzed using Rasch Measurement Theory. Results:. A total of 495 patients completed the Danish BODY-Q field-test 1–4 times, leading to a total of 681 assessments with an overall response rate at 76%. Cronbach α values were ≥ 0.90, and person separation index values were in general high. The Rasch Measurement Theory analysis provided broad support for the reliability and validity of the Danish version of the BODY-Q scales. Item fit was outside the criteria for 34 of 138 items, and of these, 21 had a significant chi-square P value after Bonferroni adjustment. Most items (128 of 138) had ordered thresholds, indicating that response options worked as intended. Conclusion:. The Danish version of the BODY-Q is a reliable and valid patient-reported outcome instrument for use in Danish bariatric and body contouring patients.