The Japanese version of the overall assessment of the speaker's experience of stuttering for adults (OASES-A-J): Translation and psychometric evaluation

•Translation and validation for the Japanese version of the OASES-A is summarized.•The OASES-A-J showed good test-retest reliability, high internal consistency, good construct validity, and concurrent validity.•Japanese adults who stutter scored higher than those USA counterparts.•The OASES-A-J could be used as a clinical tool in Japanese stuttering field.

PurposeThis study evaluates the psychometric performance of the Japanese version of the Overall Assessment of the Speaker's Experience of Stuttering for Adults (OASES-A), a comprehensive assessment tool of individuals who stutter.MethodsThe OASES-A-J was administered to 200 adults who stutter in Japan. All respondents also evaluated their own speech (SA scale), satisfaction of their own speech (SS scale) and the Japanese translation version of the Modified Erickson Communication Attitude scale (S-24). The test-retest reliability and internal consistency of the OASES-A-J were assessed. To examine the concurrent validity of the questionnaire, Pearson correlation was conducted between the OASES-A-J Impact score and the S-24 scale, SA scale and SS scale. In addition, Pearson correlation among the impact scores of each section and total were calculated to examine the construct validity.ResultsThe OASES-A-J showed a good test-retest reliability (r = 0.81-0.95) and high internal consistency (α > 0.80). Concurrent validity was moderate to high (0.55-0.75). Construct validity was confirmed by the relation between internal consistency in each section and correlation among sections' impact scores. Japanese adults showed higher negative impact for 'General Information', 'Reactions to Stuttering' and 'Quality of Life' sections.ConclusionThese results suggest that the OASES-A-J is a reliable and valid instrument to measure the impact of stuttering on Japanese adults who stutter. The OASES-A-J could be used as a clinical tool in Japanese stuttering field.