Development and validation of the 25‐item Hikikomori Questionnaire (HQ‐25)

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  • Alan R. Teo
    VA Portland Health Care System, HSR&D Center to Improve Veteran Involvement in Care Portland USA
  • Jason I. Chen
    VA Portland Health Care System, HSR&D Center to Improve Veteran Involvement in Care Portland USA
  • Hiroaki Kubo
    Department of Neuropsychiatry, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
  • Ryoko Katsuki
    Department of Neuropsychiatry, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
  • Mina Sato‐Kasai
    Department of Neuropsychiatry, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
  • Norihiro Shimokawa
    Department of Neuropsychiatry, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
  • Kohei Hayakawa
    Department of Neuropsychiatry, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
  • Wakako Umene‐Nakano
    Department of Neuropsychiatry, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
  • James E. Aikens
    Department of Family Medicine University of Michigan Ann Arbor USA
  • Shigenobu Kanba
    Department of Neuropsychiatry, Graduate School of Medical Sciences Kyushu University Fukuoka Japan
  • Takahiro A. Kato
    Department of Neuropsychiatry, Graduate School of Medical Sciences Kyushu University Fukuoka Japan

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<jats:sec><jats:title>Aim</jats:title><jats:p> <jats:italic>Hikikomori</jats:italic>, a form of severe social withdrawal, is an emerging issue in mental health, for which validated measurement tools are lacking. The object was to develop a self‐report scale of <jats:italic>hikikomori</jats:italic>, and assess its psychometric properties and diagnostic accuracy.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>A sample of 399 participants from clinical and community settings completed measures. Psychometric properties were assessed with factor analysis; diagnostic accuracy was compared against a semi‐structured diagnostic interview.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>The Hikikomori Questionnaire contained 25 items across three subscales representing socialization, isolation, and emotional support. Internal consistency, test–retest reliability, and convergent validity were all satisfactory. The area under the curve was 0.86 (95% confidence interval, 0.80–0.92). A cut‐off score of 42 (out of 100) was associated with a sensitivity of 94%, specificity of 61%, and positive predictive value of 17%.</jats:p></jats:sec><jats:sec><jats:title>Conclusion</jats:title><jats:p>The 25‐item Hikikomori Questionnaire (HQ‐25) possesses robust psychometric properties and diagnostic accuracy in an initial sample of Japanese adults. Additional research on its psychometric properties and ability to support clinical assessment of <jats:italic>hikikomori</jats:italic> is warranted.</jats:p></jats:sec>

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