Psychometric properties of the Beliefs about Medicine Questionnaire-adjuvant endocrine therapy (BMQ-AET) for women taking AETs following early-stage breast cancer

Jo Brett; Nick J Hulbert-Williams; Deborah Fenlon; Mary Boulton; Fiona M Walter; Peter Donnelly; Bernadette Lavery; Adrienne Morgan; Carolyn Morris; Rob Horne; Eila Watson

doi:10.1177/2055102917740469

Psychometric properties of the Beliefs about Medicine Questionnaire-adjuvant endocrine therapy (BMQ-AET) for women taking AETs following early-stage breast cancer

Health Psychol Open. 2017 Nov 17;4(2):2055102917740469. doi: 10.1177/2055102917740469. eCollection 2017 Jul-Dec.

Authors

Affiliations

¹ Oxford Brookes University, UK.
² University of Chester, UK.
³ Swansea University, UK.
⁴ University of Cambridge, UK.
⁵ Torbay and South Devon NHS Foundation Trust, UK.
⁶ Oxford University Hospitals NHS Foundation Trust, UK.
⁷ Independent Cancer Patients' Voice, UK.
⁸ University College London, UK.

Abstract

This study evaluated the Beliefs about Medicine Questionnaire to explore adherence to adjuvant endocrine therapy after treatment for breast cancer (BMQ-AET). Factor structure of the BMQ-AET was explored alongside internal consistency, convergent validity and acceptability. The BMQ-AET Specific Scale fitted the original 10 item model. Internal consistency of the BMQ-AET was much improved compared to the original BMQ and convergent validity showed predicted direction of correlation, although correlation with BMQ-AET concerns scale was low. Acceptability was good. The evaluation of the BMQ-AET is encouraging, and could facilitate future research around adherence to AET.

Keywords: Beliefs about Medicines Questionnaire; Beliefs about Medicines Questionnaire–adjuvant endocrine therapy; adherence; adjuvant endocrine therapy; convergent validity; evaluation; factor structure.