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Measuring Patient Needs and Benefits in Dermatology using the Patient Benefit Index 2.0: A Validation Study.
Acta Dermato-venereologica 2018 October 12
This study investigated the validity and feasibility of the Patient Benefit Index 2.0 (PBI 2.0), a short instrument to assess patient-relevant treatment benefit. In a cross-sectional study, patients with skin diseases completed the PBI 2.0 alongside instruments on quality of life and disease-specific PBI long versions to assess convergent validity. Feasibility questions appraise comprehensibility, completeness, length, and readability. Data from a longitudinal study were used to explore responsiveness and test-retest reliability. Most patients rated the PBI 2.0 easy to understand, complete, legible, and not too long. The amount of missing values was overall low. In all groups, except for vitiligo, correlation analyses indicated good convergent validity of PBI 2.0. Responsiveness of the PBI 2.0 could not be clearly confirmed. Retest-reliability achieved satisfactory results. Thus, the PBI 2.0 may be a suitable instrument for its use in different skin diseases. Its broad applicability allows for comparisons across diagnosis groups.
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