‘A Meaningful Difference, but Not Ultimately the Difference I Would Want’: A Mixed‐Methods Approach to Explore and Benchmark Clinically Meaningful Changes in Aphasia Recovery

ABSTRACT Introduction Outcome measurement instruments (OMIs) are used to gauge the effects of treatment. In post‐stroke aphasia rehabilitation, benchmarks for meaningful change are needed to support the interpretation of patient outcomes. This study is part of a research programme to establish minimal important change (MIC) values (the smallest change above which patients perceive themselves as importantly changed) for core OMIs. As a first step in this process, the views of people with aphasia and clinicians were explored, and consensus was sought on a threshold for clinically meaningful change. Methods Sequential mixed‐methods design was employed. Participants included people with post‐stroke aphasia and speech pathologists. People with aphasia were purposively sampled based on time post‐stroke, age and gender, whereas speech pathologists were sampled according to their work setting (hospital or community). Each participant attended a focus group followed by a consensus workshop with a survey component. Within the focus groups, experiences and methods for measuring meaningful change during aphasia recovery were explored. Qualitative data were transcribed and analysed using reflexive thematic analysis. In the consensus workshop, participants voted on thresholds for meaningful change in core outcome constructs of language, communication, emotional well‐being and quality of life, using a six‐point rating scale (much worse, slightly worse, no change, slightly improved, much improved and completely recovered). Consensus was defined a priori as 70% agreement. Voting results were reported using descriptive statistics. Results Five people with aphasia (n = 4, > 6 months after stroke; n = 5,