Psychometric properties of the German Stroke and Aphasia Quality of Life Scale 39 generic version.
Caterina Breitenstein, Katerina Hilari, Annette Baumgaertner and 9 others
PMID 40856374WHAT IT FOUND
The German SAQOL-39g is a reliable and valid tool for measuring quality of life in people with chronic post-stroke aphasia.
It performs similarly to the English version and is suitable for use in both clinical practice and research trials.
Key findings
01The German SAQOL-39g demonstrated acceptable reliability, validity, and responsiveness in a sample of 156 people with chronic aphasia.
02Psychometric properties were highly similar to the original English version, supporting its use for cross-cultural comparison in aphasia research.
03The scale showed sensitivity to change, with small-to-moderate improvements in quality of life scores observed after intensive speech and language therapy.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study was not primarily designed for psychometric evaluation, so some COSMIN requirements (such as sample size for factor analysis) were not fully met, although the sample size of 156 is large for aphasia research. Test-retest reliability was lower than expected, possibly due to the long interval between assessments (21 days) or treatment expectation effects in the waiting-list group. The minimal clinically important change (MIC) was calculated using physical independence (mRS) as an anchor, which may not be the most relevant measure for aphasia-specific outcomes. Three items showed different factor loadings compared to the English version, suggesting potential cultural or linguistic nuances in interpretation.
Declared interests
Funding was provided by the German Federal Ministry of Education and Research and the Society for Aphasia Research and Treatment. One author is the developer of the original English SAQOL-39g. Other authors have disclosed various consulting and speaker relationships with pharmaceutical companies, but the sponsor was not involved in the research.
The easy way to misread this
Do not assume the German SAQOL-39g has identical psychometric properties to the English version. Test-retest reliability was moderate rather than excellent, and some items loaded on different factors, which may affect how scores are interpreted in clinical or research settings.