ArticleFrontiers in psychiatry2026
Reliability and convergent validity of the Japanese version of the Adult ADHD Investigator Symptom Rating Scale: a multicenter, longitudinal, non-interventional study.
Article in Frontiers in psychiatry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder that often persists into adulthood, negatively impacting occupational, social, and economic outcomes. The Adult ADHD Investigator Symptom Rating Scale (AISRS) is a clinician-administered tool designed to evaluate ADHD symptom severity and treatment response. However, a validated Japanese version is not available. This study evaluated the reliability and convergent validity of the Japanese version of the AISRS (AISRS-Japanese) in adults with ADHD. Methods: Following linguistic validation procedures, the AISRS was translated into Japanese and reviewed by clinicians for conceptual and clinical equivalence. This was a multicenter, longitudinal, non-interventional study assessing the psychometric properties of the AISRS-Japanese. The evaluation instruments were the AISRS-Japanese, the Adult ADHD Self-Report Scale (ASRS-Japanese version), and the Clinical Global Impressions-Severity (CGI-S) scale. Reliability assessments included internal consistency (Cronbach's alpha), test-retest, intra-rater, and inter-rater reliability (intraclass correlation coefficient [ICC] and G(q,k) coefficients). Convergent validity was evaluated via Pearson's correlation between AISRS-Japanese and ASRS-Japanese version scores. Results: In total, 61 adults with ADHD were included in the analysis. The mean age of the study participants was 34 years, 52.5% (32/61) were male, and 75.4% (46/61) were moderately ill (CGI-S score of 4). The AISRS-Japanese demonstrated internal consistency for the total scale (Cronbach's alpha = 0.83) and the hyperactivity/impulsivity and inattention subscales (0.76 and 0.75, respectively). Test-retest reliability was good (ICC: total, 0.77; hyperactivity/impulsivity, 0.79; inattention, 0.83), as was intra-rater reliability (ICC: total, 0.76; hyperactivity/impulsivity, 0.77; inattention, 0.83). Inter-rater reliability was excellent (G(q,k): total, 0.96; hyperactivity/impulsivity, 0.97; inattention, 0.96). Convergent validity of the ASRS-Japanese version was high (correlation coefficient: total, 0.89; hyperactivity/impulsivity, 0.88; inattention, 0.84). Conclusion: These results provide evidence supporting the reliability and convergent validity of AISRS-Japanese as a semi-structured tool for assessing ADHD symptoms in Japanese adults.
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