title: Psychometric properties of the Japanese version of the Weiss Functional Impairment Rating Scale: Self-Report.
abstract: The Weiss Functional Impairment Rating Scale Self-Report has been translated into nine languages and has been widely used in assessing functional impairment of adults with ADHD. This study is a psychometric validation of the WFIRS-S in Japanese. The WFIRS-S-J and other questionnaires were administered to 46 adults with attention-deficit-hyperactivity disorder (ADHD), 104 control adults, and 889 university students. ADHD diagnoses were made using the Japanese semi-structured diagnostic interview for adult ADHD, which is compatible with the DSM-5. All subscales of the WFIRS-S-J had Cronbach's α values of around 0.80. Total scores on the WFIRS-S-J had high test-retest reliability after a 2-week interval. The total score, subscale scores, and 59 of the individual item scores of the 70 items in the WFIRS-S-J were significantly higher in the ADHD group than in the other two groups, although more than half of the items in subdomain G (risk) showed floor effects and did not reach significance. Generally WFIRS-S-J subdomain scores were moderately correlated with scores on the Japanese version of Conners' Adult ADHD Rating Scales Self-Report subscales. WFIRS-S-J scores were also correlated (albeit more weakly; 0.31 ≤ r ≤ 0.55) with Beck Depression Inventory II total scores. The WFIRS-S-J showed acceptable psychometric properties, although further study is necessary.
authors.affiliation: Department of Clinical Psychology, Ryukoku University, 125-1 Daiku-cho, Oomiya-higashi-iru, Shichijyo-dori, Shimogyo-ku, Kyoto, 600-8268, Japan. t-tak@umin.ac.jp.
authors.forename: Toshinobu
authors.identifier: http://orcid.org/0000-0002-6905-5013
authors.initials: T
authors.lastname: Takeda
authors.affiliation: School of Psychological Science, Health Sciences University of Hokkaido, Sapporo, Japan.
authors.forename: Yui
authors.initials: Y
authors.lastname: Tsuji
authors.affiliation: School of Psychological Science, Health Sciences University of Hokkaido, Sapporo, Japan.
authors.forename: Junichiro
authors.initials: J
authors.lastname: Kanazawa
authors.affiliation: Graduate School of Education and Human Development, Nagoya University, Nagoya, Japan.
authors.forename: Takanobu
authors.initials: T
authors.lastname: Sakai
authors.affiliation: Child and Adolescent Psychiatry, University of Arkansas Medical Sciences Child Study Centre, Little Rock, AR, USA.
authors.forename: Margaret D
authors.initials: MD
authors.lastname: Weiss
mesh_terms: D000328:Adult; D000368:Aged; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis*; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D011594:Psychometrics; D057566:Self Report; D014177:Translations; D055815:Young Adult
keywords: Attention-deficit–hyperactivity disorder (ADHD); Functional impairment; Psychometric properties; Weiss Functional Impairment Rating Scale Self-Report (WFIRS-S)