the research was performed

the cross-sectional reliability and validity of the Parent Report Form of the Child Health and Illness Pro-file-Child Edition (CHIP-CE), a generic measure of health-related quality of life (HRQoL), in children with ADHD in the pan-European ADHD Observational Research in Europe (ADORE) study. Methods Parents of children with ADHD (aged 6–18 years) in 10 European countries completed the CHIP-CE at the baseline visit (n = 1,477; data missing for one patient).Analyses included determination of internal consistency reliability, ceiling and floor effects, factor analysis, and Pearson’s correlations between CHIP-CE and other scales used to measure ADHD severity, problems and family strain. Results Internal consistency reliability was good-to-excellent (Chronbach’s α> 0.70) for all CHIP-CE domains and subdo-mains, and almost no ceiling and floor effects were observed. Factor analysis of the subdomains yielded a 12-factor solution. The domain-level factor analysis identified six factors, the four domains of Satis