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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. Conclusion: The child/adolescent and parent/proxy versions of the J-KIDSCREEN-27 and J-KIDSCREEN-10 demonstrated acceptable levels of reliability and validity. [ABSTRACT FROM AUTHOR]

Objectives: The present study aimed to assess the reliability and validity of the Japanese version of KIDSCREEN-52 (J-KIDSCREEN-52), a generic questionnaire used to assess health-related quality of life (HRQOL) among children/adolescents and parents/proxies. Methods: We conducted a school-based study, in which 1564 children and adolescents aged 8-18 years and their 1326 parents participated from five schools. They were asked to complete two questionnaires (the J-KIDSCREEN-52 and the Pediatric Quality of Life Inventory (PedsQL)), and the Oslo 3-Item Social Support (OSS-3) scale. Internal consistency reliability was measured using the Cronbach's alpha coefficient. Test-retest reliability was assessed by the Intraclass Correlation Coefficient (ICC) in the one-way random effects model in sub-samples taken approximately three to four weeks apart. Agreement between the ratings of the child and parent was evaluated using the ICC in the two-way mixed effects model among 681 pairs. Results: For the overall sample, Cronbach's alpha values of 10 dimensions were ≥0.70, except for one dimension. Test-retest ICCs were ≥0.60 for nearly all dimensions. Correlation coefficients between the J-KIDSCREEN-52 and the PedsQL dimensions indicated a reasonable convergent validity. Parent ratings corresponded well with child ratings (ICC = 0.38-0.62). Statistically significant differences in mean T scores were dependent on gender for seven dimensions, age group for all dimensions, and health status for two dimensions. Conclusions: The J-KIDSCREEN-52 questionnaires child/adolescent and parent/proxy versions demonstrated acceptable levels of reliability and validity. [ABSTRACT FROM AUTHOR]