Journal
EUROPEAN JOURNAL OF VASCULAR AND ENDOVASCULAR SURGERY
Volume 47, Issue 1, Pages 100-107Publisher
W B SAUNDERS CO LTD
DOI: 10.1016/j.ejvs.2013.10.009
Keywords
Lymphedema; Lipedema; Patient benefit; Patient-reported outcomes; Quality of life; Validation
Categories
Funding
- medi GmbH & Co. KG, Bayreuth, Germany
- 3M Deutschland GmbH, Neuss, Germany
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Objectives: Patient-relevant treatment benefit is traditionally measured with health-related quality of life. (HRQoL) instruments. The Patient Benefit Index (PBI) methodology allows for a more direct measurement, with the patients rating both importance and achievement of treatment goals. Here, we developed and validated a PBI version specific for the assessment of benefit in lymphedema and lipedema treatment (PBI-L). Methods: The development included five steps: (1) open item collection; (2) consensus of items in a multidisciplinary expert panel; (3) application of the German PBI-L in a cross-sectional study (n = 301); (4) translation into English; (5) application of the English PBI-L in a randomized clinical trial (n = 82). Subscales were developed using factor analysis. Construct validity was analyzed by correlating PBI-L and convergent criteria such as HRQoL and quality of care. To test for responsiveness, the association to change in HRQoL measures was computed. Results: Floor and ceiling effects were low. There were few missing values. Two well-interpretable subscales were Found with Cronbach's alpha >0.8 each. Global and subscale scores correlated with convergent criteria and with change in disease-specific HRQoL, but not with change in generic HRQoL. Conclusions: The PBI-L is an internally consistent, valid, and responsive instrument for the assessment of patient-relevant benefit of edema treatment. (C) 2013 European Society for Vascular Surgery. Published by Elsevier Ltd. All rights reserved.
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