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Plast Reconstr Surg Glob Open. 2017 Oct 20;5(10):e1529. doi: 10.1097/GOX.0000000000001529. eCollection 2017 Oct.

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

Author information

1
Department of Plastic Surgery, Odense University Hospital, Odense, Denmark; Department of Plastic Surgery, OPEN, Odense Patient data Explorative Network, Odense University Hospital, Odense, Denmark; Department of Paediatrics, McMaster University, Hamilton, Canada; Department of Plastic Surgery, Hospital of Southwest Jutland, Esbjerg, Denmark; Department of Psychology, University of Southern Denmark, Odense, Denmark; Department of Endocrinology, Hospital of Southwest Jutland, Esbjerg, Denmark; Center for Eating Disorders and Department of Endocrinology, Odense University Hospital; The Psychiatric Services in Southern Denmark, University of Southern Denmark, Denmark; and Stefan Cano, Modus Outcomes, Letchworth Garden City, United Kingdom.

Abstract

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.

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