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09.11.2019 | Gynecologic Oncology

Psychometric validation of the Breast Cancer Treatment Outcome Scale (BCTOS-12): a prospective cohort study

verfasst von: Manuel Feißt, Jörg Heil, Ilona Stolpner, Alexandra von Au, Christoph Domschke, Christof Sohn, Meinhard Kieser, Geraldine Rauch, André Hennigs

Erschienen in: Archives of Gynecology and Obstetrics | Ausgabe 6/2019

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Abstract

Purpose

The Breast Cancer Treatment Outcome Scale (BCTOS) is a questionnaire to evaluate the aesthetic and functional outcome after breast conserving surgery (BCS). The original BCTOS with its 22 items on three subscales was refined to a shorter, improved, and easier to administer patient-reported outcome measure, the BCTOS-12. The BCTOS-12 consists of 12 items on two distinct subscales, the Functional Status and the Aesthetic Status. The aim of this study was to validate the BCTOS-12 in a prospective cohort.

Methods

For this study, 239 breast cancer patients were included preoperatively, and 204 patients completed the BCTOS-12 and EORTC QLQ C30 BR23 shortly after their BCS, corresponding to a follow-up rate of 85%. The item-factor structure was examined by confirmatory factor analysis. The reliability was calculated by McDonald’s Omega for estimating internal consistency. The convergent validity was assessed by Spearman’s rank correlation coefficients between the related scales of the questionnaires.

Results

The BCTOS-12 showed a robust item-factor structure and a good internal consistency with McDonald’s Omega of 0.89 for the Aesthetic Status and 0.90 for the Functional Status. A high convergent and divergent validity was indicated by correlations between the subscales of the EORTC QLQ C30 BR23 and the BCTOS-12.

Conclusion

Overall, the results demonstrate a successful psychometric validation of the BCTOS-12. The BCTOS-12 is a refined, improved, and now validated, instrument. It can be used in clinical studies and routine management for the evaluation of the aesthetic and functional outcome after BCS.

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Titel: Psychometric validation of the Breast Cancer Treatment Outcome Scale (BCTOS-12): a prospective cohort study
verfasst von: Manuel Feißt
Jörg Heil
Ilona Stolpner
Alexandra von Au
Christoph Domschke
Christof Sohn
Meinhard Kieser
Geraldine Rauch
André Hennigs
Publikationsdatum: 09.11.2019
Verlag: Springer Berlin Heidelberg
Erschienen in: Archives of Gynecology and Obstetrics / Ausgabe 6/2019
Print ISSN: 0932-0067
Elektronische ISSN: 1432-0711
DOI: https://doi.org/10.1007/s00404-019-05362-y

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Psychometric validation of the Breast Cancer Treatment Outcome Scale (BCTOS-12): a prospective cohort study

Abstract

Purpose

Methods

Results

Conclusion

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Purpose

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