title: Reliability and validity of Japanese versions of KIDSCREEN-27 and KIDSCREEN-10 questionnaires.
abstract: OBJECTIVE
  This study aimed to assess the reliability and validity of Japanese versions of the KIDSCREEN-27 (J-KIDSCREEN-27) and KIDSCREEN-10 (J-KIDSCREEN-10) questionnaires, which are shorter versions of the KIDSCREEN-52 (J-KIDSCREEN-52).
  
  
  METHODS
  The present analyses are based on a pre-existing dataset of the J-KIDSCREEN-52 validation study, including 1564 children and adolescents aged 8-18 years and their 1326 parents. All were asked to complete the J-KIDSCREEN and Pediatric Quality of Life Inventory (PedsQL) questionnaires. Test-retest reliability was assessed with Intraclass Correlation Coefficients (ICCs) in a one-way random effects model, and internal consistency reliability was measured using Cronbach's alpha coefficients. Agreement between child and parent scores was evaluated using ICCs in a two-way mixed effects model. To assess concurrent validity, a sub-sample of 535 parents evaluated their child's mental health status using the Strengths and Difficulties Questionnaire (SDQ).
  
  
  RESULTS
  For children, test-retest ICCs were ≥0.60 and Cronbach's alpha ≥0.70 for every dimension of both instruments. Correlations of corresponding dimensions between the J-KIDSCREEN-27 or -10 and the PedsQL were acceptable. For parents, test-retest ICCs were ≥0.60, Cronbach's alpha ≥0.70, and ICCs between child and parent scores ≥0.41 in every dimension of both instruments. In multivariate logistic regression models, after adjusting for confounders, lower health-related QOL in every dimension of both instruments, except Physical Well-being, was significantly associated with higher odds ratios for borderline and clinical ranges of the SDQ.
  
  
  CONCLUSIONS
  The child/adolescent and parent/proxy versions of the J-KIDSCREEN-27 and J-KIDSCREEN-10 demonstrated acceptable levels of reliability and validity.
authors.affiliation: Department of Community Health and Epidemiology, Nara Medical University School of Medicine, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan.
authors.forename: Satoko
authors.initials: S
authors.lastname: Nezu
authors.affiliation: Center for Special Needs Education, Nara University of Education, Nara, Japan.
authors.forename: Hidemi
authors.initials: H
authors.lastname: Iwasaka
authors.affiliation: Department of Community Health and Epidemiology, Nara Medical University School of Medicine, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan.
authors.forename: Keigo
authors.initials: K
authors.lastname: Saeki
authors.affiliation: Department of Community Health and Epidemiology, Nara Medical University School of Medicine, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Obayashi
authors.affiliation: Department of Food and Nutrition Faculty of Contemporary Human Life Science, Tezukayama University, Nara, Japan.
authors.forename: Rika
authors.initials: R
authors.lastname: Ishizuka
authors.affiliation: Department of Education for Children with Disabilities, Kyoto University of Education, Kyoto, Japan.
authors.forename: Hideyo
authors.initials: H
authors.lastname: Goma
authors.affiliation: Pediatrics of Higashiosaka City General Hospital, Higashiosaka, Osaka, Japan.
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Furuichi
authors.affiliation: Department of Community Health and Epidemiology, Nara Medical University School of Medicine, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan. knorio@naramed-u.ac.jp.
authors.forename: Norio
authors.initials: N
authors.lastname: Kurumatani
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D010290:Parents; D011594:Psychometrics / Q000379:methods*; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*
keywords: Children; Health-related quality of life; KIDSCREEN; Mental health; Validity