Acceptability, reliability, and validity of the Japanese version of the Stroke and Aphasia Quality of Life Scale-39 without illustrations.

Authors

Yuhei Kodani, Hikaru Nakamura

Published in

International journal of speech-language pathology. Pages 1-11. Jul 05, 2026. Epub Jul 05, 2026.

Abstract

This study aimed to address limitations in international equivalence and psychometric quality of the Japanese version of the Stroke and Aphasia Quality of Life Scale-39 (SAQOL-39-J). We developed the SAQOL-39-J without illustrations (SAQOL-39-J-ni) to enhance international comparability and assessed its acceptability, reliability, and validity.
We recruited 100 participants (mean age = 61.64 years), including 92 individuals with post-stroke aphasia. Acceptability was examined through skewness, ceiling, and floor effects. Reliability was evaluated via internal consistency and test-retest reliability. Validity included assessments of internal and convergent validity.
Eight items (20.51%) did not meet skewness criteria, but the deviation was minor. No ceiling or floor effects were observed. Cronbach's α was 0.95, and test-retest reliability showed an ICC of 0.94 (95% CI: 0.86-0.97). Inter-item correlations ranged from rho = 0.21-0.79, and convergent validity showed total score correlations rho = -0.01-0.45.
The SAQOL-39-J-ni demonstrated strong psychometric properties comparable to international versions. It is a reliable outcome measure for people with aphasia in Japan, supporting both clinical use and cross-cultural research.

PMID:
42402068
Bibliographic data and abstract were imported from PubMed on 05 Jul 2026.

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